Malicious PDF — malware analysis report

Static analysis result for SHA-256 9727aba096f1258b…

MALICIOUS

PDF

76.9 KB Created: 2021-05-31 23:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 33b109e92e734926e12f71a33dd6e31d SHA-1: c4e729d34668d0ce96315dcc5b2aa66dbec9f269 SHA-256: 9727aba096f1258b9bdf3bea0b4222c69631aa1ebeaf5e569ac223582039b8ce
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/123?utm_term=above+and+below+sea+level+worksheet PDF link annotation
    • https://vosefeluvem.weebly.com/uploads/1/3/5/3/135382784/8739702.pdfIn PDF document text
    • https://xiwiriled.weebly.com/uploads/1/3/4/8/134899872/3291446.pdfIn PDF document text
    • https://miganavon.weebly.com/uploads/1/3/4/3/134368237/88eb7c22388.pdfIn PDF document text
    • https://gejizataki.weebly.com/uploads/1/3/3/9/133997606/pilopowusonaw.pdfIn PDF document text
    • https://jiwedizuku.weebly.com/uploads/1/3/4/3/134310564/wubofesut_jexiza_zijurotegotizax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476001/normal_605639160bf97.pdfIn PDF document text
    • https://ribufesoguvas.weebly.com/uploads/1/3/4/6/134680119/7bec54.pdfIn PDF document text
    • https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/2573881.pdfIn PDF document text
    • https://vatalinonabalix.weebly.com/uploads/1/3/4/2/134234662/2f0e82263ca9.pdfIn PDF document text
    • https://jesakejijubew.weebly.com/uploads/1/3/4/5/134577011/juvafulonemabib-loxad-fatovinosilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4859805/normal_60663195d898d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144418140/15246981713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f43eeeb-c23b-4794-8019-69b826d3a215/xarigusis.pdfIn PDF document text
    • http://xujefix.pbworks.com/w/file/fetch/144423390/6769094765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa0b1b9d-b3a6-4e20-a38d-3207977d2cd2/takaxab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f1fa238-9cbd-46eb-94f4-8778b49ecabf/insinkerator_evolution_spacesaver_xp_troubleshooting.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144412536/vamupaxodoxedigexor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/117280b8-2aa3-429d-b99e-5910fb4a3a84/kegepotirasenufufeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed51f867-8794-447c-b0ce-da37edc9b5d9/18841514854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a2bfd5-7794-462e-9f31-198232ab7662/shimano_alfine_internal_gear_hub_8-speed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaacbd61-f720-4da3-9651-96edf3e05284/45297057110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0085e357-268b-46e6-951c-583d665f6e75/duralowa.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_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 5260 bytes
SHA-256: 5377119b905e4a79f423a42037e86c73328c70f032f582f98d849e844f318f64
font_01_sfnt_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 11316 bytes
SHA-256: b5aacacae14d64e43bd786f567033f6d3be3d965a096a5de6323a7767225e630