Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ba5115d99ecbff…

MALICIOUS

PDF

106.3 KB Created: 2021-10-06 10:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fd0027eb4dfb8509bb345a7bbab0e626 SHA-1: 011abfa433cb89b22f53a5eb6e83837327fed5a4 SHA-256: 36ba5115d99ecbff9980d5b650ed7096df4aa584186d197161f54c8824f297a1
146 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.findvoters.com/userfiles/file/suxaniwabibexaseximevof.pdf In PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/ac280cfc7aec9560249107378bb35c13/30591032284.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/katelas.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/68550547407.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161410f26c877c---72140923984.pdfIn PDF document text
    • https://aokman-drive.com/d/files/xijijilekavojonexigatutib.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/2252374027.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/65054322762.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/fodapasegizepelijog.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/gozuxusejafi.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/25720534162.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/biworiwozeworem.pdfIn PDF document text
    • https://expomediainc.com/upload/file/17391359414.pdfIn PDF document text
    • http://cocoal.com/uploads/file/28650637724.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/82443128388.pdfIn PDF document text
    • http://ekosertifikat.uznature.uz/userfiles/file/nototijelelomoj.pdfIn PDF document text
    • http://pferdplus.at/sites/pferdplus.at/files/file/natipazijasoj.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/vovexopizotelimegawifawir.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/83756953081.pdfIn PDF document text
    • http://aeu.pretty-match.com/upload/files/nilurusonoxonotesutimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=second+bank+of+the+united+states+apushPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/zadovodirijelarokexovupo.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://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_off00013612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E24 21260 bytes
SHA-256: 93ccecf8f6b704b76e7f07ef22ce3d12e301ed80d7ba9997958574a6f33d7fc0
font_02_sfnt_off0001856b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1856B 10980 bytes
SHA-256: 5c2d2582a77bbb8c2d9d8d4dc18f3ec6a275d3c3ea60badea52ef59356a968f5