Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c00030ba3086d8…

MALICIOUS

PDF

88.6 KB Created: 2021-09-12 03:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 178673f938606eee82f2a9fb8f52070e SHA-1: d6617c6935cd4df3075a01c24cf4f2321e5d2ca4 SHA-256: 12c00030ba3086d80591d854e17e662a4b82a15a1e8b0df7d0423b97dccb9735
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution scheme. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating the PDF is designed to host many links on potentially untrustworthy domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://archism.ru/uplcv?utm_term=torete+basic+guitar+chords PDF link annotation
    • https://paperland.bg/uploads/file/71836400097.pdfIn PDF document text
    • http://goldmustang.ru/files/files/19326454657.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/89991970579.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109042249318441.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/sunosoror.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/bomezulomonepobebavujito.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/visozebijozuxule.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/jasareseduvovuxabazonup.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/vujidulowevitamifiwukif.pdfIn PDF document text
    • http://polipack.ru/content/file/49013049754.pdfIn PDF document text
    • http://epmachine.ru/d/files/23662901800.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/90122876777.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/fatogomaxugowaba.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/tosoxek.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/fejewirifapikojepadem.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/xubetozexuligowutunil.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/zifoxasikinisomono.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/padebogamezotemaf.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/70855457452.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/kobumowazisinemebuwar.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/80505259430.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 10704 bytes
SHA-256: d5e22e9dcdc66d2439b9abeec86cb0b9a1196806c342e37e3b916175eee1c6d1
font_01_sfnt_off00011143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12955 16740 bytes
SHA-256: 2da240843da7858fe8bc2ff88ba219de13be91de1952412ba74f56de2a031b94

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