Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb6001299f9e852…

MALICIOUS

PDF

73.0 KB Created: 2021-03-07 19:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4cea032138bd7903ff9ac2fa8de12834 SHA-1: 214f30e9c33e32c415659252a6333e5d5a71d1f8 SHA-256: cdb6001299f9e85231aa2f559c6c8650f8f7ad186e8fbb38077c3bad46c07bd7
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 for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the phishing/trojan detection strongly indicate an intent to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=baldur%2527s+gate+dark+alliance+2+xbox+iso PDF link annotation
    • http://trells.space/18086742066o8489.pdfIn PDF document text
    • https://cdn.sqhk.co/bipaneri/jfvDKmk/sonalalapupexusukise.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/hunter_x_core_will_not_reset.pdfIn PDF document text
    • http://zelopaqq.xyz/148949841454fac0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501383/normal_603a3f887970a.pdfIn PDF document text
    • https://cdn.sqhk.co/talegejusa/bZjhhab/1447135408.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/13074987059.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/84588908358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445733/normal_6019216180712.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/a7809040-5664-4e92-88ec-019970f42080/digital_photography_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12e30ffd-75c4-4e3d-88c9-696532cbdf84/writing_quadratic_equations_in_standard_form_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09936b1c-f585-4eef-860f-bc3f2967c8d8/gofibamivutolibejudij.pdfIn PDF document text
    • http://koradanizepagow.myartsonline.com/34461408906.pdfIn PDF document text
    • http://pivimufe.atwebpages.com/zuvijadufoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf2c6fc1-6ec9-4786-8e99-04c8d354d83f/bill_nye_rock_cycle_video.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_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 5596 bytes
SHA-256: 3a8c310e95146294d3cd10243fd381218b221274eb4acedfb8ab7a36eb16e11c
font_01_sfnt_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 14120 bytes
SHA-256: cc3d373f96bf65c4a22b19994e0149e8ac5f9268a50acb65a04e1063771f6682

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