Malicious PDF — malware analysis report

Static analysis result for SHA-256 6343b1690fe204df…

MALICIOUS

PDF

76.4 KB Created: 2021-03-01 13:15:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 9c93443aaa9604250838384842949acf SHA-1: ef30124bdcb58e59f1521e5aa4a5390e48a70947 SHA-256: 6343b1690fe204df2ec8883213ff5c78ebefa4983c19d5c09992554e7856717a
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded URLs are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=can+anyone+learn+cloud+computing PDF link annotation
    • http://kovuzaxaf.medianewsonline.com/suwazisumojezelujiru.pdfIn PDF document text
    • https://xuxuratedagofat.weebly.com/uploads/1/3/4/6/134644764/nusokejadipulo-fanekobituvadaj.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/67142263760.pdfIn PDF document text
    • https://bilewobadazape.weebly.com/uploads/1/3/2/6/132695578/7935400.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/uQyigX6/rororepododirajamil.pdfIn PDF document text
    • http://jabewes.medianewsonline.com/how_to_make_a_video_with_dog_talking.pdfIn PDF document text
    • http://ig-soft-team.com/clavier_francais_android3z8s3.pdfIn PDF document text
    • http://innov-cis.net/photo_collage_maker_for_facebook_freeexcqr.pdfIn PDF document text
    • https://xikunozazoteta.weebly.com/uploads/1/3/1/4/131453294/befavirelubime-bewinokusoma-totiwufelo-xagefurex.pdfIn PDF document text
    • https://warogowi.weebly.com/uploads/1/3/1/6/131606132/nanebanozok.pdfIn PDF document text
    • https://wosiwimobej.weebly.com/uploads/1/3/1/1/131164223/xadivukokowu.pdfIn PDF document text
    • https://sagiwotagemo.weebly.com/uploads/1/3/1/8/131871993/58896c100f.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/4216604.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xolemobubusosi.rf.gd/wekegigitul.pdfIn PDF document text
    • http://tuzuxutetug.atwebpages.com/pideruzeri.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_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 5224 bytes
SHA-256: 48685f56166c67fc4931043c0a36be27a7505d845a614d0ccf88d7b2b22d9560
font_01_sfnt_off0000fec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC9 11068 bytes
SHA-256: 1fc6aff780102e160b88887bbf8816338aeca9d0706068db2cfee0a13710d7c1

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