Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc54506768a64db…

MALICIOUS

PDF

75.7 KB Created: 2021-09-09 09:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d273c59cdb9fa82cab5f3e8d6f0f009 SHA-1: 53170e6626604ad002841d5ac6f65c202b0d9b36 SHA-256: cfc54506768a64dbb230a34f41e7dc9aeb565faacee390ce20e148d60d459605
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which are unknown or potentially disposable. The presence of many embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or scam attempt designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://kop-trans.pl/uploads/userfiles/files/63668377183.pdf In PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/venoganenovomofufuzew.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/rirasamepitifupo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/26495e2786c5f40921d91a5049fbb0a7/samefun.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/79670318948.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/56264091427.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/pemalemawiketiremufep.pdfIn PDF document text
    • https://bfull.ru/uploads/files/gitasurasiburokoj.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/45377176407.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/48932962290.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/71353963964.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/joroboxeselixom.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/nabaje.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/65174318868.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/koxapejuje.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202108312258186991.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/wifudowalipoguke.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/3148293026.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/22226956392.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/xupiwitewod.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/50223691838.pdfIn PDF document text
    • http://moristas.com/userfiles/files/batigokaxitifojamomolus.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/6714613331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+phone+as+webcam+windows+10PDF link annotation
    • 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_off0000c323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 17392 bytes
SHA-256: 5947c35a23b53860b8961d28cb74c1189fdd4d73f5901231269b33c42999273e
font_02_sfnt_off00010837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 11016 bytes
SHA-256: 0e0cede4ff671d6ef83b4d3d64a69bd74782ea04c24ba6b8af26ed2829280713