Malicious PDF — malware analysis report

Static analysis result for SHA-256 3938428d6ad902a0…

MALICIOUS

PDF

126.5 KB Created: 2021-03-20 06:03:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0e6eccf58c37a88c784e7fea93ad7422 SHA-1: 7531ab335d0564373f355a112d3eba9962e42740 SHA-256: 3938428d6ad902a0a44e5336ff7bd405c0016758fe7221cd30df8bb839d96667
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=ancient+indian+history+timeline+pdf PDF link annotation
    • http://trickyturkey.com/zlatan_bolanle_mp4_videoisydi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416932/normal_5ffa01271581f.pdfIn PDF document text
    • https://tiwedipetubed.weebly.com/uploads/1/3/2/8/132816066/bagazi_batodiwidoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492880/normal_602a59edbac8c.pdfIn PDF document text
    • http://naturebiolog.fun/what_castle_was_used_in_the_count_of_monte_cristoq5e8h.pdfIn PDF document text
    • http://omerkatanalp.com/11474896507e6rms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408720/normal_60489f7a77c66.pdfIn PDF document text
    • http://fullcreditreport.info/96261289050oqhlf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_6037d5bdaafe3.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/aeoujgq/minecraft_hopper_cart_unloader.pdfIn PDF document text
    • https://vifojozajo.weebly.com/uploads/1/3/1/4/131454549/nopajuwulokoxavazidi.pdfIn PDF document text
    • https://cdn.sqhk.co/kofelejezem/aVYmic9/pureflix_membership_cost.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447258/normal_5ffd0e99c41b5.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/iigGOUs/health_tips_for_seniors_in_the_spring_break.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484821/normal_602929844cdb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392867/normal_5fddd53c454ef.pdfIn PDF document text
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/jawesaximufi.pdfIn PDF document text
    • https://pawusavexamase.weebly.com/uploads/1/3/0/8/130813618/17581836c3387.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A303 5484 bytes
SHA-256: 9532dfb2bb4fe81de2d8d50484b9146b51fd0919e60ef281b9e7401a67015f83
font_01_sfnt_off0001b58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B58D 12312 bytes
SHA-256: 3831fc0676b2f811e6264e44a826d17d68a1d6ffbc5e926a3355503b4d042278
font_02_sfnt_off0001df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF29 3156 bytes
SHA-256: a98389c32100bc44b3bd19fb4a0d4502352f520cbc44b4c9afcbb1e1ad8b5f8f

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