Malicious PDF — malware analysis report

Static analysis result for SHA-256 f427d94c0ff107d9…

MALICIOUS

PDF

118.7 KB Created: 2021-03-01 20:11:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a0187d04483b749a4e9fc3843763f28b SHA-1: d0cc15e73e42096cdcc259e68c30ca07497878a6 SHA-256: f427d94c0ff107d919ca2428750fa9e78fd80662043b14e8bed76e897755b45a
126 Risk Score

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 0.9999

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=hp+deskjet+2544+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480161/normal_5ff0c50892102.pdfIn PDF document text
    • https://wolagevujizerul.weebly.com/uploads/1/3/5/3/135316080/gamibopefub.pdfIn PDF document text
    • http://s7hmus.org/sisojilazizasohzw8a.pdfIn PDF document text
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/d7c37d6c47d33.pdfIn PDF document text
    • https://xidoteruredogon.weebly.com/uploads/1/3/1/4/131454367/zopiwet.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/rajewuwomukake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475382/normal_602ab6e236f82.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/towelojopunaxoxupiwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5fd1ab53ade93.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/how_to_put_away_graco_pack_and_play_with_bassinet.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/libro_gramatica_y_ortografia_basica_de_la_lengua_espaola.pdfIn PDF document text
    • http://teasmall.space/jenemido1waf1.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/how_to_pass_six_sigma_black_belt_exam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380705/normal_6022b025122e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423732/normal_60085dee65115.pdfIn PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/6886905.pdfIn PDF document text
    • https://matexofetuboso.weebly.com/uploads/1/3/1/4/131453592/528359.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosajeku.myartsonline.com/the_sworn_book_of_honorius.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_off00018fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FFF 5452 bytes
SHA-256: 5f0eb1b69c3573fae925580d7e0b877372829c1296dbf12e45edce1a0a83e0fb
font_01_sfnt_off0001a28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A28D 12608 bytes
SHA-256: ea8e2385e634ef49bb80c887a46d556de495655bfb36a599836dbeb55be4b961