Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8b3e56efa88b17…

MALICIOUS

PDF

76.6 KB Created: 2020-11-11 08:28:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df34bb8ea28baf192a36abd6f56a08a6 SHA-1: d34e042f9013a30bb9a438833c9ad09f0bfca218 SHA-256: aa8b3e56efa88b170fbb5346d5848f3eac7b327d56e29864d27c2a4022aa3ee8
176 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a callback phishing scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous external links, with one pointing to 'https://trafftec.ru/123?keyword=genasi+dnd+5e+race+stats', suggesting it may be part of a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into contacting fraudulent support or refund services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://trafftec.ru/123?keyword=genasi+dnd+5e+race+stats
    • https://jibametugo.weebly.com/uploads/1/3/4/4/134486067/bekiw.pdf
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/6063700.pdf
    • https://vegiranelikir.weebly.com/uploads/1/3/4/3/134399044/ladur.pdf
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/dabowuxire.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5aa445b2-43ae-4c2c-afc5-37cd862b0fb5/badulozemeta.pdf
    • https://uploads.strikinglycdn.com/files/29072b9c-423a-47c8-9a2e-8390607a4460/phone_numbers_generator_extractor.pdf
    • https://s3.amazonaws.com/zunewidimem/kenmore_sewing_machine_manuals_385.pdf
    • https://uploads.strikinglycdn.com/files/9b4921b1-0044-4dc6-a421-e4a8628cdf42/37461729227.pdf
    • https://uploads.strikinglycdn.com/files/20cae92c-3ec8-46c6-b054-f29bdca5ab7e/fasanosokojajafe.pdf
    • https://uploads.strikinglycdn.com/files/97a5e257-ad30-42ca-ae93-21a9a4c3d235/26695263967.pdf
    • https://s3.amazonaws.com/davolazupivowi/calendario_2019_escolar_2020_estado_de_mexico.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_off0000f117.bin
e10f4cf32463c55645fc3ab546a15fbf8c5bf65a492648725dd34f0849f439fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF117 5056 bytes
font_01_sfnt_off0001025d.bin
ead3950abb40bc5c8cc3060a75ff89af653fd66e633a34d1cbb68b8eb98d63ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1025D 10432 bytes

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