Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6aa2bbfaef2dbf4…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 09:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 98c442244b9103fd93922709bb555550 SHA-1: c2c0a8c8651cfa3a3fa7a5b3264fbb4328ebd8ed SHA-256: d6aa2bbfaef2dbf4839ee7323a9ace1a497d6788d79acf2b730e5451e4537177
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest the document acts as a gateway to a link farm, likely for phishing or distributing further malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://sentezetutmerkezi.com/upload/ckfinder/files/setagijogabi.pdf In PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136373cdcffe---ferobilimamu.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/vupakigonolake.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/77230834448.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/10430346725.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/lowejoratefijekax.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/gipit.pdfIn PDF document text
    • http://shamayachts.com/upload/file/38860785002.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/62710883638.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/ravifesogubakuror.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f034633e54---27041198281.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/95940517823.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/31039673742.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/73913024688.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/zoxepekebepume.pdfIn PDF document text
    • http://stisk.com/file/tabapugosasinagevux.pdfIn PDF document text
    • https://trystsalonri.com/images/file/47779776362.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/5827773961.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/88655538123.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/pipusikiboxetagajitemamu.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/tojejowirasemenelotipo.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/61172013217.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/17511077439.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/90723916106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=deleted+pictures+on+android+phonePDF link annotation
    • 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_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 17620 bytes
SHA-256: 886604ab0f363438e23fe9e498279f919d6d9da5a969963c92a288000275544d
font_01_sfnt_off00011832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13049 10712 bytes
SHA-256: 1d1d8578f5892a00f1d9afd2fbe3db2e85f5f9a48249f04f90119c63489dbdef

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