Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4204f929b5d0da…

MALICIOUS

PDF

73.5 KB Created: 2020-12-25 17:51:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8e7faa8ba2db98da3e36de9e8f1b8267 SHA-1: 4da4d82b46e68f74f4cdff34c167a8ce0a1c3481 SHA-256: 6a4204f929b5d0dace0de96fe760964901289f4d93cf11c8c004a0c7f6684cc8
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics and a machine learning classifier. It contains a significant number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=dinosaur+caves+park+open PDF link annotation
    • https://cdn.sqhk.co/gikunixa/gjjhnHp/screen_recorder_video_recorder_game_recorder_apk.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/8748791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f9e6511489c7.pdfIn PDF document text
    • https://cdn.sqhk.co/navififoro/hj2jaib/international_business_management_quiz_questions_and_answers.pdfIn PDF document text
    • https://zafigitelerom.weebly.com/uploads/1/3/4/3/134338481/wituseruloluzube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451737/normal_5fcf2dc39407d.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/7109055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417119/normal_5f9da2f5c3414.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/zokupodud-gileroduwof-dezifanawemefi-lovoxisapilu.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/lusilataviludova.pdfIn PDF document text
    • https://nobixerevogug.weebly.com/uploads/1/3/4/4/134481004/kobudapiliv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392220/normal_5fb35304dddf0.pdfIn PDF document text
    • https://gasutasisewejiv.weebly.com/uploads/1/3/4/4/134403787/rurodakuke_gifowuzola_zasamewisigix.pdfIn PDF document text
    • https://cdn.sqhk.co/satovepato/gcxWZjf/tifadasiwawuvagekage.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/hdhgRja/fogefajaxibuvogukapidu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 5016 bytes
SHA-256: 6f894c50e7569dc2396e90058aef430c990ebfb861bad725116bee3ebc3a8882
font_01_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 11772 bytes
SHA-256: e36a42c55c951dbd76ee3ed37abfbf924679caed079a8eeb5855be68c4e340a8

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