Malicious PDF — malware analysis report

Static analysis result for SHA-256 678b99c439b151f3…

MALICIOUS

PDF

76.4 KB Created: 2021-04-05 19:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8775d4b0e7a30872946466c0cf3580ed SHA-1: 7023eb46550f4113cec8dc094f810960ea628739 SHA-256: 678b99c439b151f3a5d4430380f1c40a209974064941698aade6500e65d34627
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://vilenefex.ru/strik?utm_term=epson+730hd+audio+out PDF link annotation
    • http://vezukugijisepo.scienceontheweb.net/25223849949.pdfIn PDF document text
    • http://kaxavetaxudu.mywebcommunity.org/nunojobawevedunaka.pdfIn PDF document text
    • http://crubr.space/lab_attendant_question_paperfuda9.pdfIn PDF document text
    • http://zoxodur.sportsontheweb.net/63020184072.pdfIn PDF document text
    • http://fherixq.com/144961735957tg9v.pdfIn PDF document text
    • https://pebawatiwokup.weebly.com/uploads/1/3/4/5/134576243/c678c0337ff492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503578/normal_6018871d07bac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416318/normal_5fe1413a2d6be.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/isometric_drawing_exercises_with_answers.pdfIn PDF document text
    • http://skameyki.club/nebesosumpew8j.pdfIn PDF document text
    • https://lewovabarififu.weebly.com/uploads/1/3/1/4/131453312/533883.pdfIn PDF document text
    • https://gawufuxawejax.weebly.com/uploads/1/3/1/8/131855981/3122339.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/477cfa44-7ff4-47a3-bf69-570e47edf359/26637178359.pdfIn PDF document text
    • http://xekapakifujekem.onlinewebshop.net/everything_michael_buble_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/518d7a8c-f6c2-43aa-9d21-f5c466c144a0/does_sat_math_2_given_formulas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6884c1e9-c43d-4f3b-89ed-6e51a500337c/when_did_christianity_start_to_spread.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6637048a-09a5-44d2-a86f-d127a789cf23/how_much_does_it_cost_to_replace_a_galaxy_tab_screen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/879ab581-9f37-4d8c-8059-7c83d0d68335/nepikejipumosunowezixata.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_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 5264 bytes
SHA-256: 41be2e9172fe2fd5796339ad921f3a54303204731c3b96561e4e55da3f77f647
font_01_sfnt_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 10860 bytes
SHA-256: 076bc56c139afbb133b88685ec0e1d243a8206a36a86f13c1e8dc31721edae80

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