Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87962b0b834ed42…

MALICIOUS

PDF

109.3 KB Created: 2021-03-11 16:51:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b01ff4e1f75dc3606301af4c5a8d571d SHA-1: 241906583c1a12fd8dbfcf05195c154374979e55 SHA-256: e87962b0b834ed4201380866b2332ca904b3afb165321953992fabaf8c9c6f9c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external links to other PDFs hosted on various domains, suggesting a tactic for SEO manipulation or payload distribution. The presence of multiple external links and the detection as a phishing trojan strongly suggest this file is part of a larger malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9628

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lozipotod.ru/strik?utm_term=listening+synonyms+hearing PDF link annotation
    • https://cdn.sqhk.co/vasinabew/hfijchi/evacuated_solar_tubes_price.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/bieLLY8/reversible_belt_buckle_spring_repair.pdfIn PDF document text
    • https://kokozorakozuwel.weebly.com/uploads/1/3/0/7/130775651/355bb9aa0aa.pdfIn PDF document text
    • https://cdn.sqhk.co/lizuxutagisu/PrheXb0/offroad_legends_2_mod_apk_1._2._12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456135/normal_6026d0fd40b14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452850/normal_602abdeaabfec.pdfIn PDF document text
    • http://leseweremizew.scienceontheweb.net/29387355503.pdfIn PDF document text
    • https://patajarixeli.weebly.com/uploads/1/3/1/0/131070073/73db7ad3cdd8f.pdfIn PDF document text
    • https://cdn.sqhk.co/budafitanu/agjHhep/how_to_recharge_nepal_mobile_from_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/jjgjgje/48817816302.pdfIn PDF document text
    • https://cdn.sqhk.co/lusesito/hd9bnCr/zevutase.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/vatidebogidosupojul.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/dtKhTJx/30267418537.pdfIn PDF document text
    • https://mewarikubunaku.weebly.com/uploads/1/3/1/6/131637951/mizuvolapafejo_dowowaferita_bilaxopa.pdfIn PDF document text
    • https://gibinefofagal.weebly.com/uploads/1/3/4/6/134668975/bitatutavod_buronedogi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/f023e285-d9ed-4904-aed5-b2bb8796035b/how_do_i_turn_off_voicemail_on_my_doro_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c35b8609-0358-47d8-bf22-8c6ef5d41562/the_new_deal_great_depression_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a703e8bc-bce1-4e89-a39b-cda41f629081/mtd_8hp_chipper_shredder_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6025c120-9e1e-436d-bddd-0e03f3112d90/what_is_the_beautiful_story_of_your_life_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0ed7a00-120d-4c34-bff1-9368039b12c2/69253932310.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/principles_of_risk_management_and_insurance_14th_edition_isbn.pdfIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/98674430428.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/jeep_cherokee_problems_2017.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_010_off00017afb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17AFB 18176 bytes
SHA-256: e43eb858545a4d9b6abacc8c33ec9501d2ae64a4dc3cc092ef357486bb4e7a32
font_00_sfnt_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 5684 bytes
SHA-256: caeed39893b82969c26dfcac95946a3fad4fbae0765b3ea81aa15456cfe783a6
font_01_sfnt_off00010af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF2 5108 bytes
SHA-256: e8e75f2ea92f86b56f1d7dcda92cbadb10f00207eb578e00669bcb174c0005f7
font_02_sfnt_off00011c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2F 2656 bytes
SHA-256: 1620336da6018abf771a3b64a4739dbc5cc5761e5bcfd31f9568e9163b5e6178
font_03_sfnt_off00012736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12736 2328 bytes
SHA-256: 6d897259d7ab9db79b0dbb16904cd99ff486aa7f4a475590a5d3e44eab6e0eed
font_04_sfnt_off000131ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EC 2108 bytes
SHA-256: b3976ad28991401f3a7e0d936621f3963ed8fd81aff5bedc9e25cf6548b1959b
font_05_sfnt_off00013bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB7 6640 bytes
SHA-256: c8cb303e765c67f43d6d34f29c1d02953890772ff7b697be779fb29335000f72
font_06_sfnt_off00014d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D56 14628 bytes
SHA-256: 17511e668b91474c249e41d9b592e51a31637d7a38dc6752b63d55078d780431
font_08_sfnt_off000197cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197CB 3276 bytes
SHA-256: 333cf0bae5291019b79d77a37696b89786718dc77a0e6f1c7356514a48765311

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