Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d628fb2fabec57…

MALICIOUS

PDF

82.3 KB Created: 2021-05-30 16:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d6eec668447c439ae0f4270d4e2eae5 SHA-1: d4ff44415390a087c89c0e6240d7e090cc293297 SHA-256: b3d628fb2fabec57f7da303a623b774387972494ad21b37ec244ac6d698051ac
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or ad fraud. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/123?utm_term=captain+california+king+platform+bed+frame
    • https://pafetuvuwube.weebly.com/uploads/1/3/4/3/134321561/2935925.pdf
    • https://vabemeraronoj.weebly.com/uploads/1/3/1/4/131452983/rimeketusuridatu.pdf
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5fe78a1c00444.pdf
    • https://mepodatadun.weebly.com/uploads/1/3/1/4/131452799/1735676.pdf
    • https://xawimoveparuz.weebly.com/uploads/1/3/4/0/134040397/9951393.pdf
    • https://cdn-cms.f-static.net/uploads/4466364/normal_606bdc54b9152.pdf
    • https://cdn-cms.f-static.net/uploads/4480893/normal_5fe894570ad8e.pdf
    • https://pafuwaron.weebly.com/uploads/1/3/4/3/134385690/fexeradimij.pdf
    • https://static.s123-cdn-static.com/uploads/4369633/normal_60017574be351.pdf
    • https://kunolutupevuj.weebly.com/uploads/1/3/4/7/134772201/94742571.pdf
    • https://dobukikiwaf.weebly.com/uploads/1/3/5/2/135295041/vudovizo_jotovem.pdf
    • https://static.s123-cdn-static.com/uploads/4387582/normal_5fcea1b09814f.pdf
    • https://sebigazawipad.weebly.com/uploads/1/3/0/8/130814057/2022279.pdf
    • https://sapemeke.weebly.com/uploads/1/3/2/8/132814969/winowogamudajug-wodujujo.pdf
    • https://cdn-cms.f-static.net/uploads/4474722/normal_6025831d587da.pdf
    • https://cdn-cms.f-static.net/uploads/4419001/normal_602002c850c3c.pdf
    • https://cdn-cms.f-static.net/uploads/4408335/normal_6049d84e35240.pdf
    • https://berekiba.weebly.com/uploads/1/3/1/4/131482976/vafigoxilis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/623b0d8c-bf25-45c5-8049-8b3072ce4ffe/12207050790.pdf
    • https://uploads.strikinglycdn.com/files/7c966c56-f8a1-430d-bbdf-caddf871beb7/all_souls_cemetery_hours_of_operation.pdf
    • https://uploads.strikinglycdn.com/files/d644d038-d146-4dcd-b8d6-53292c85d1e9/rekaniregidape.pdf
    • https://uploads.strikinglycdn.com/files/1a960bfc-35da-44f5-9810-3c8bd9a7abe5/6250719737.pdf
    • https://uploads.strikinglycdn.com/files/276bf0b9-6b9c-4a92-b03a-cdb50a7ed10f/why_wont_my_garage_door_light_go_off.pdf
    • https://uploads.strikinglycdn.com/files/d5c8ba69-51b4-4df3-b8aa-f5e10b2e8a7c/horizon_zero_dawn_frozen_wilds_hunting_grounds_guide.pdf
    • https://uploads.strikinglycdn.com/files/7958d080-d212-4b19-8690-8cf8592655db/oster_clipper_customer_service.pdf
    • https://uploads.strikinglycdn.com/files/952e55a1-5033-4bc0-a99b-9ce1b6d50c0d/white_christmas_1954_cast_ages.pdf
    • https://uploads.strikinglycdn.com/files/f8efc3cf-21cf-4c3f-a94f-d1f9e5401380/37286521210.pdf
    • https://uploads.strikinglycdn.com/files/2b791660-edd6-4135-b7db-41386daf11c9/the_number_one_million_in_standard_form_represents.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_off000101c5.bin
d01cb9555a384e22bbe154fbdc9bfa4adec98052b1dca382ec64701cb9d332fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 5408 bytes
font_01_sfnt_off00011411.bin
1b7ccc5eb289640fe5403a8a03229e2450a35ab56aac2ce9046fc75c2f89265b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11411 11368 bytes

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