Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c16b9915a5bf8f1…

MALICIOUS

PDF

63.5 KB Created: 2020-11-13 17:03:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5f027734fdaa08f235c6298ec1b49983 SHA-1: 1989d95a1cd36a112bfc4a9689d6ca17f0f0dc9b SHA-256: 4c16b9915a5bf8f1c5b0862362e55e3c01c859b6f11ed2f33274cfbf12f94ac4
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

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/strik?utm_term=thompson+center+thunderhawk+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425759/normal_5f9bb6986ceaf.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/bobolujur_gajeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5f8aa1d7829a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_5f8c892a10137.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/7157364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389127/normal_5f95836115ebf.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/gipij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492915/normal_5fabfc016c7a0.pdfIn PDF document text
    • https://fisizupesaxog.weebly.com/uploads/1/3/1/6/131636899/4562043.pdfIn PDF document text
    • https://tijujuvuxerupuz.weebly.com/uploads/1/3/4/2/134236121/tunugega.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b0fe94-f1ad-4bfa-853d-84d18be3b72c/eastside_baptist_church_statesville_nc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b77a958-0386-4678-9836-4e878a4695fa/29408260651.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/circular_motion_lab_physics_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/philosoraptor_meme_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a016acf2-8de9-454a-a9fa-69a17d36a1e8/95842879033.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_off0000ba1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1C 5388 bytes
SHA-256: 16cbce86a7b5e01a8303c9b0ef1c0aa572efd6b28119a2178dbd066d653aa0c0
font_01_sfnt_off0000cc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC52 10820 bytes
SHA-256: 52f8fca54fbab0555d18c74559f0d0c3556fb9c803e6379c944467e43969c345

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