Malicious PDF — malware analysis report

Static analysis result for SHA-256 4592a0926ddaafe5…

MALICIOUS

PDF

70.1 KB Created: 2020-11-19 22:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 362d326dfed7d97cc85815a1aff2eeac SHA-1: d9a7a6d2bb2a5fdb76be96018c1489a44391fa60 SHA-256: 4592a0926ddaafe542b6cf623045dd80c3debeaca934f9370ef929d0c29a498e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, indicating a link farm for traffic generation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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?utm_term=suing+judges+a+study+of+judicial+immunity PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393349/normal_5f9c97e19b0cd.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/rarel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_5f8edaedb1f90.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/ab82e48.pdfIn PDF document text
    • https://mokufomaduw.weebly.com/uploads/1/3/4/6/134600220/a82943bf9bf.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/xojafemori/agonistas_alfa_2_adrenrgicos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b62b5c-0593-4148-978e-86241f9aa04b/bell_and_howell_projector_model_253_ax_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe11673a-c325-4c79-8862-e5aa9f1412ea/56054289151.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/powerpoint_presentation_templates_technology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666e14e4-9e16-4d3a-b26c-02986f04c42c/46710653661.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/ddo_spell_resistance_items.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/10191588922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4a0508-f74d-4b0d-a185-73dddaa7520d/kugatef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e88bb029-0946-44a2-9cdf-37021ddd655e/patuvubipo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CB 5528 bytes
SHA-256: 1034d220f2c6e71f8f889a2d9ccfe0f18be0368c543ff8bb6b50967cbcf053f1
font_01_sfnt_off0000e699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE699 10880 bytes
SHA-256: 5590864038da09aaccf77a2feb0db344c38d728b1f6ee655adac2ccbd1de3745

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