Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a080dcaf7fe468…

MALICIOUS

PDF

74.9 KB Created: 2021-01-14 06:37:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1da6abda0432effad6aa458c459ae895 SHA-1: 75c957275250bba65d0663f8e1d894848236d501 SHA-256: b4a080dcaf7fe46819f47a70812f8cd43e5373e5d1c2d7cf06ddf1860e771a21
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with a high number of external URIs pointing to various domains, including a suspicious one at trafftec.ru. The document body is heavily obfuscated and contains what appears to be embedded content, suggesting an attempt to disguise malicious links or scripts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/aws?utm_term=dragon+ball+z+abridged+super+android+13 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466386/normal_5fb71b2edae27.pdfIn PDF document text
    • https://site-1173205.mozfiles.com/files/1173205/bell_buzzer_difference.pdfIn PDF document text
    • https://site-1177918.mozfiles.com/files/1177918/mapuzutowaxef.pdfIn PDF document text
    • https://site-1177779.mozfiles.com/files/1177779/87958591619.pdfIn PDF document text
    • https://site-1166051.mozfiles.com/files/1166051/31905052822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384308/normal_5fa72ba05c158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5f889a98926b9.pdfIn PDF document text
    • https://site-1175108.mozfiles.com/files/1175108/23516977023.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456134/normal_5ff4cab453880.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456114/normal_5fff15081343a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/goneduzum/runitesol.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/c_see_reference_to_class_template_instantiation.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://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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB2 3116 bytes
SHA-256: 37a8edf27fd88ddb3dae94d934e5108d73ba34fe8609f8e453d2210f6d2edbdf
font_01_sfnt_off0000e6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CF 5532 bytes
SHA-256: 1919347fc586b4ec59dc0b2cdd07622706fa2784a5dfaa6ec14309aef3997d2a
font_02_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 11112 bytes
SHA-256: bfee92aeb5c9494a114a25d5a29b1e6748dfd6962e093577cfa69ab64921cf15

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