Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d91d0bbcac5187…

MALICIOUS

PDF

79.5 KB Created: 2021-03-13 19:28:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3f876f2e09b78622e2408b783b78bc79 SHA-1: 195afcbe6de0d73d7e98ba4fc0144aca670c5a38 SHA-256: e3d91d0bbcac5187aa8d39639984248b4c2150e4d7c9edbbf15bdd24fd27864e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, containing numerous external URLs, some of which are hosted on disposable domains. The primary URL, 'https://ponafet.ru/123?utm_term=fiberglass+vs+cellulose+insulation+performance', suggests a potential lure related to insulation performance, possibly to disguise the malicious nature of the document. No scripts were extracted, but the structure suggests it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/123?utm_term=fiberglass+vs+cellulose+insulation+performance PDF link annotation
    • https://cdn.sqhk.co/dubutemaruxu/hhmA8jc/26128539917.pdfIn PDF document text
    • https://cdn.sqhk.co/jomawutid/jnifjgy/jesavukutogabujukomur.pdfIn PDF document text
    • https://cdn.sqhk.co/mekibekowufe/c9aShXQ/zitusubaribogazelatakes.pdfIn PDF document text
    • https://cdn.sqhk.co/mejiwimuza/g71Nhhr/94419159020.pdfIn PDF document text
    • https://cdn.sqhk.co/nibidawe/diejjyT/tan_card_application_form_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/jbijzja/passcode_off_lock_screen_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/runetonorox/iaU5jaV/50995806728.pdfIn PDF document text
    • https://cdn.sqhk.co/bidomutarili/yLDlZji/flyff_harlequin_quest.pdfIn PDF document text
    • http://bowoporoj.iblogger.org/awlgrip_545_application_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/fibiixd/33332190875.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_9627c8249b4746fcb58acdb402131723.pdf?index=trueIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_aa87b380ea73483fae6a75e956825fc9.pdf?index=trueIn PDF document text
    • http://fevidubigozexa.rf.gd/vosepegegarosa.pdfIn PDF document text
    • http://gudanomakorake.epizy.com/46960294187.pdfIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_10fc01fcd7ac47d494daf7af4fc36988.pdf?index=trueIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_da3eecb9f5264cd99c58fdf4b7e2a2d5.pdf?index=trueIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_a2048414405445efbb77e50f94a5b248.pdf?index=trueIn PDF document text
    • http://meganabinas.rf.gd/blister_formed_after_bug_bite.pdfIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_ac50c6137add4996bdffe3abe5809f2d.pdf?index=trueIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_94fbf606610c46aa90ad19c1fc9924a0.pdf?index=trueIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_274ab766539b49c89e776d86e16292cc.pdf?index=trueIn PDF document text
    • https://ec75ba9f-29a7-4b73-bb51-4c951d20089f.filesusr.com/ugd/17cde0_b819edcb7e5d452fbe5cf46aaf4ed797.pdf?index=trueIn PDF document text
    • http://toxawilel.epizy.com/beauty_plus_premium_unlocked_apk.pdfIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_31b2d01b50b24860b38d649f910db51a.pdf?index=trueIn PDF document text
    • http://pikigefunix.epizy.com/gartner_studios_printable_place_cards_template.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F0 5488 bytes
SHA-256: c063538c7abeb99221c073104ec9863d95244af4d45d5df186f3f6cf7a238c63
font_01_sfnt_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 11116 bytes
SHA-256: 3370083596fc2875ec1ef0633a9cf9c0d5e5556cbd69d15131c51e2be91c6ff6

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