Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4d69c2af8c042c…

MALICIOUS

PDF

73.2 KB Created: 2021-03-07 05:15:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 885529caa3ee23fe8ff04b6893aee08a SHA-1: bb36a2c288d409ed47f2f10f73c32ac46cf44c99 SHA-256: ac4d69c2af8c042c0bec1c97a3b65a656a11985c2156c1b6bd392caac4cf6bc3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic to drive traffic to potentially malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=goddess+oracle+cards+hathor
    • https://cdn.sqhk.co/teketerep/XVAQ1hh/merge_dragon_carnival_event_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4384160/normal_600774189d210.pdf
    • https://cdn.sqhk.co/rabovafom/j2gehcj/spider_man_running_games_online_no_download.pdf
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/2721535.pdf
    • https://toruganaduloxo.weebly.com/uploads/1/3/5/3/135347606/18b821c.pdf
    • https://zegesunipatobas.weebly.com/uploads/1/3/1/3/131379774/lezizazoziloba.pdf
    • https://cdn.sqhk.co/vakanaju/ijigcZI/12783113865.pdf
    • https://cdn-cms.f-static.net/uploads/4404983/normal_5fd12493202db.pdf
    • https://sokexeziboril.weebly.com/uploads/1/3/4/9/134902232/2259733.pdf
    • https://cdn-cms.f-static.net/uploads/4463807/normal_602f9458aefcb.pdf
    • https://cdn-cms.f-static.net/uploads/4368951/normal_600f5942ab2d3.pdf
    • https://cdn.sqhk.co/juzurupivepo/fbers5r/22842448230.pdf
    • https://cdn-cms.f-static.net/uploads/4390068/normal_6019386e014f5.pdf
    • https://womerakuketuzal.weebly.com/uploads/1/3/1/8/131856195/c6ea99b578cd.pdf
    • https://cdn.sqhk.co/kokademesuz/jWB47vn/retro_drive_in_theatre.pdf
    • https://cdn-cms.f-static.net/uploads/4451954/normal_5fe8952fa2af4.pdf
    • https://cdn-cms.f-static.net/uploads/4486994/normal_5fe7c089a887c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bitizopovopaso/block_format_business_letter_example.pdf
    • https://s3.amazonaws.com/mudurixo/journalism_internships_summer_2021_washington_dc.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e394.bin
9cd693778e2c08b7630965da5393260151333e49909a28f317faa29067f22fa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE394 5056 bytes
font_01_sfnt_off0000f4b8.bin
c5880fab65c3f677503945fdb1e5fbc3a202df043ff76e209cd4faf0aff798dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 10288 bytes

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