Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9265d76b34243d…

MALICIOUS

PDF

84.8 KB Created: 2021-05-08 19:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b146f0d567d17624fd18173825d1bd1f SHA-1: 011e67957377cedc02691f278c216ae048a36f96 SHA-256: 2c9265d76b34243dd8ed410570cc29a80763d6b5d463afc7f6be83028a5d2615
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect the user to malicious content, likely for credential harvesting or further payload delivery.

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://zajinet.ru/strik?utm_term=movies+like+me+and+earl+and+the+dying+girl+reddit PDF link annotation
    • https://cdn.sqhk.co/noloxunipe/3wij3Ry/swarthmore_college_majors.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/ifjihiI/chicken_goat_cheese_salad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_606833f67a304.pdfIn PDF document text
    • http://sodaapp.club/1499614920594ptp.pdfIn PDF document text
    • http://bestsalestoday.xyz/tanirukebomidiradi0h3up.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368777/normal_5fc6a6b09e49b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368222/normal_6029799ae36f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_601e1a9689e22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413238/normal_5feb98fd18e53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372360/normal_603b4b44ad21b.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/idlk13N/64981649091.pdfIn PDF document text
    • http://consequences.space/zovosatupanubobalozudinuc4e8.pdfIn PDF document text
    • https://cdn.sqhk.co/tefegegesuxe/Hr3ieih/ski_safari_1._5._4_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455376/normal_603a0807cbacb.pdfIn PDF document text
    • http://blancop.xyz/adguard_premium_apk_final4zse9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noxanaviki.rf.gd/libro_de_instrumentacion_industrial_creus.pdfIn PDF document text
    • http://tazigedefabe.rf.gd/command_prompt_commands_free_download.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_off00010bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 5468 bytes
SHA-256: 9c16ab645c2bd2de7827f51d9ee0c4fe51b4cfec4b5ae96f375871e7e0005cc6
font_01_sfnt_off00011e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E75 11140 bytes
SHA-256: 2e8a5e79402ffdf682d9aec424124a08eb72bbe4ebf3f01564c2e1c8cbcec5ad

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