Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a66c79a451e661…

MALICIOUS

PDF

75.8 KB Created: 2021-04-08 13:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d6ec350a8c787a5a61ecc206f70378f4 SHA-1: dbb87030e1c6cb0b3c8595c0056d95c41948042e SHA-256: 80a66c79a451e6610d4027e53f9fcc31842df1aa11920696f8f0d53e66a1bb38
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://fokemale.ru/strik?utm_term=church+of+christ+sermon+outlines+in+pdf+format PDF link annotation
    • http://nakodinita.scienceontheweb.net/shackle_type_insulator.pdfIn PDF document text
    • https://fubolilodizewe.weebly.com/uploads/1/3/5/3/135312413/kanerej-kesafof-bovuxepumupati.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/bear_apprentice_3_specs.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvinudubuno/dibRhfZ/23476142162.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/python_and_algorithmic_thinking_for_the_complete_beginner.pdfIn PDF document text
    • https://roxeviviko.weebly.com/uploads/1/3/5/3/135317288/7912904.pdfIn PDF document text
    • http://fajufoturesu.sportsontheweb.net/37205252890.pdfIn PDF document text
    • http://devubowoku.mypressonline.com/financial_administration_act_2020_act_654.pdfIn PDF document text
    • https://naluzamuro.weebly.com/uploads/1/3/4/5/134516405/69732.pdfIn PDF document text
    • https://kotutoxegaru.weebly.com/uploads/1/3/2/6/132695780/biluwavew.pdfIn PDF document text
    • https://fitijozis.weebly.com/uploads/1/3/4/3/134372299/2169083.pdfIn PDF document text
    • https://lomimasexoguxi.weebly.com/uploads/1/3/4/7/134736135/1240610.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e50ac724-0547-426e-bf11-b58714692e44/phonetic_alphabet_chart_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cdebb52-57ed-4821-9fd2-bc083fe89f84/91708850449.pdfIn PDF document text
    • http://xukokumo.myartsonline.com/candidose_digestive_traitement.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 5300 bytes
SHA-256: 7f3bb76aaea7d9bb15c548745127704b07a4ef02e3d5f150cec8fe12887eba20
font_01_sfnt_off0000fda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA2 10768 bytes
SHA-256: e65f6ac9940e9d54658f1be4052d37b6690d8ef2b8d71fa4a2fab75cf3cdb364

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