Malicious PDF — malware analysis report

Static analysis result for SHA-256 71041db53227d85b…

MALICIOUS

PDF

99.0 KB Created: 2021-04-01 10:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 20447fe4be1bf2c72b8f91ada1c476cc SHA-1: cca5031f277ce79d02ac5c22e7c92a03b150561e SHA-256: 71041db53227d85b2f76ebca918cb18401b39f6930dc2460c1395502fc6a022f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links to other PDF documents hosted on various domains, some of which are disposable. The primary URL, 'https://jumiwimov.ru/award?keyword=law+of+agency+in+zimbabwe+pdf', suggests a potential SEO manipulation tactic or a lure to download further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/award?keyword=law+of+agency+in+zimbabwe+pdf PDF link annotation
    • https://powifamule.weebly.com/uploads/1/3/4/7/134757347/0b752971.pdfIn PDF document text
    • http://daating19.site/4_pic_1_word_game_answers_5_lettersd30n6.pdfIn PDF document text
    • https://ninefajesazaga.weebly.com/uploads/1/3/5/3/135384029/4ba3f46d3106.pdfIn PDF document text
    • http://rodina38.ru/functional_independence_measure_scoringzmjdh.pdfIn PDF document text
    • http://grenkasalo4.xyz/jukoxixoselel346of.pdfIn PDF document text
    • https://mefovisesivem.weebly.com/uploads/1/3/4/5/134525463/1221670.pdfIn PDF document text
    • https://leneguvajetuse.weebly.com/uploads/1/3/1/3/131380977/towemulimir_rafoxikivunibak.pdfIn PDF document text
    • https://witabavuwimob.weebly.com/uploads/1/3/4/3/134339013/kovugesuziritu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/microsoft_word_shortcut_keys_cheat_sheet.pdfIn PDF document text
    • http://tezipibuboxigo.epizy.com/garadedipunorigevogofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecef86de-d87f-4b68-bfbd-7359a2efa808/xepatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1317e9-d4f1-47cf-8d01-a30967ebb46a/50079110829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/046830a2-6c0d-43b4-8847-ffe814372aac/52559627210.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/polisacaridos_sulfatados.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a07320f1-9e6e-442b-8e9f-bfd528270390/dialectical_behavior_therapy_treating_borderline_personality_disorder.pdfIn PDF document text
    • http://notadagas.rf.gd/periodic_table_elements_full_name.pdfIn PDF document text
    • http://gerodusiwisegog.rf.gd/10587040676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43c00271-72d5-40fb-b1af-0466ed123e7f/opentx_companion_2.2.1_download.pdfIn PDF document text
    • http://vegosazozadexe.epizy.com/articulos_cientificos_ecologia.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/lafuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/mujaxobupawamuvafod.pdfIn PDF document text
    • http://sawezivolepusan.epizy.com/tuparebanafafigej.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_off0001470c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470C 5492 bytes
SHA-256: ff1367e72b1931db601a2460095fb4ee17e7f13c2a00d28c8a4ae0b56ca07715
font_01_sfnt_off000159d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D9 10900 bytes
SHA-256: 69834379049e475196a78403a82745150e3f005524459fcc54a2e709cfa1aae1