Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a17cee4c60f7f97…

MALICIOUS

PDF

76.2 KB Created: 2021-04-06 01:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 621b544d5c7f82d2d83c60c3bae085e4 SHA-1: 8031d7df18223462c2fb188cb8df8c7999469948 SHA-256: 6a17cee4c60f7f97405b2522acf49a3541d70dfeff882a1c604d292284d5e8bf
186 Risk Score

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 0.9995

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://jacksth.ru/strik?utm_term=who+were+the+8+clergymen PDF link annotation
    • https://pikupazu.weebly.com/uploads/1/3/4/5/134577858/cb9e4fcb2.pdfIn PDF document text
    • https://linazoforup.weebly.com/uploads/1/3/0/8/130814758/8224571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505096/normal_606a36389a6cb.pdfIn PDF document text
    • https://xisezuvu.weebly.com/uploads/1/3/4/0/134096300/c2e903976942.pdfIn PDF document text
    • https://kisuwirabavaruz.weebly.com/uploads/1/3/3/9/133999170/pipepagamotamelepisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_602304b4c857a.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/9286918.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411691/normal_5fc7f6e369993.pdfIn PDF document text
    • https://petenugilamabo.weebly.com/uploads/1/3/1/4/131453278/da803ec80.pdfIn PDF document text
    • https://raserigu.weebly.com/uploads/1/3/4/7/134725151/xasamivukereg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475397/normal_5ffe4a586d24b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375076/normal_5fe7dbde61054.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/28f095e8-deea-4415-8400-1a85859708ad/blogger_seo_tips.pdfIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_01ce4991c74845988fc02a4332820d98.pdf?index=trueIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_afae7849f0554ff69ca731ece8c7707f.pdf?index=trueIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_a12d8836db5d46edbe3e16a9521c4031.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7aa4b1-0f97-48f4-b721-62177c0a2702/jajijevin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea0443b4-e425-4300-b41c-88d6650db493/dipugilimarijasaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d2dc5f-9295-41a7-91a4-f0f04d00eae5/94349174630.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd9861fc-db8e-4ef0-8e2e-787a6d1a3524/160946125.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_84ae8364640f43ca8e490fa5f26b3bf7.pdf?index=trueIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_e841ce4e469c4cb2ae0f87cd9983e432.pdf?index=trueIn 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_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 5224 bytes
SHA-256: 3a33ab79f2d417abc54d1d331160f74b8f68e45a0151cec42c681324dc9c5d1d
font_01_sfnt_off0000fe70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE70 10332 bytes
SHA-256: 3dac75fe77b9b6c74503a6726f7600331d71df59e6660d79abbf7e2a6980c669