Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a364ea4616cb709…

MALICIOUS

PDF

71.2 KB Created: 2021-05-10 22:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 49c1f795f01b95be2d4f4f65a2788d84 SHA-1: 1b623ff0259dd6a85762f51e11384a967dd3c6fb SHA-256: 2a364ea4616cb7094522a8bde8a3c01fdf99503562a07cef8f2f9cd999f7be19
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the presence of numerous external URIs points to the document's intent to redirect users to potentially harmful sites.

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://bologen.ru/strik?utm_term=berkeley+innovation+index PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407724/normal_603a545fbcf4b.pdfIn PDF document text
    • http://xarapover.mygamesonline.org/definition_of_affective_commitment.pdfIn PDF document text
    • http://podipotekoi.ru/pikokedibetomuwejn9lkx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376105/normal_5fca782936ee2.pdfIn PDF document text
    • http://grizhoff.ru/how_to_fix_usb_flash_drive_not_detectedp689o.pdfIn PDF document text
    • http://sifimomikev.sportsontheweb.net/ccna_v6_espaol_descargar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_5fe7eae277120.pdfIn PDF document text
    • http://vienvozvrat.site/juzojokopobamisiloxiplai1b.pdfIn PDF document text
    • http://sellforce.ru/black_friday_iphone_deals_2019_uk_apple9fxap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387806/normal_5fecb5eb57e27.pdfIn PDF document text
    • http://manybigs.space/why_do_certain_atoms_combine_to_form_a_compoundpc9gw.pdfIn PDF document text
    • http://homebig.space/tratamiento_de_trombosis_venosa_profundamlyef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_0645b2cbff3b4fa2baf3c3f5d4c3e5ba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39478f12-e772-49af-92ed-27ce74d52da3/pupelagigija.pdfIn PDF document text
    • http://titugol.atwebpages.com/poduzapofogovuguregan.pdfIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_eb76d2078bd14ab58e608ce1a9a361b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/759c1bcc-9d1b-43df-9df7-5e2d894b53ce/23622928432.pdfIn PDF document text
    • http://vexolofifete.atwebpages.com/aashto_bridge_design_specifications.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_off0000d7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A9 4984 bytes
SHA-256: 803561bce4b03bcec4c586528e94293365fcbd77638dfaea7ea310153e48935d
font_01_sfnt_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 10992 bytes
SHA-256: c806d00ee3c38981ec33a29cdf00eb3a9507df2ed0b0a560802fa000dbf8a541

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