Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f49e237acdfdca…

MALICIOUS

PDF

70.8 KB Created: 2021-01-06 11:16:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f006b97e057aafb41c135e1550973a1d SHA-1: 68437687d3b8e654c8e348342660aa713e2147d2 SHA-256: d3f49e237acdfdcac895f6718f45c0ec7d3bcaf0a2fe486d627fad1be759d6db
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs confirms the attempt to redirect the user to external 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=cooking+with+dog+okonomiyaki In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389074/normal_5fa72e237c03b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5f88d8cc78c09.pdfIn PDF document text
    • https://zaxiradijewebox.weebly.com/uploads/1/3/4/8/134889682/2632364.pdfIn PDF document text
    • https://cdn.sqhk.co/lezebulodiw/9hegjgf/best_gaming_wallpapers_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_5f914a8ccc19e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485696/normal_5fc1d5a52b9d2.pdfIn PDF document text
    • https://cdn.sqhk.co/sukexesi/BjfgdMO/lunukuvijoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494146/normal_5fe249d21ddce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/microfinance_ireland_business_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/tojumamovepavomom.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/modern_social_work_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/irrigation._punjab._gov._pk_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/cyclohexane_conformation_stable.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/bifrontismo_tasso.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/asus_driver_notebook.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_off0000d771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 5096 bytes
SHA-256: f4367df5c4f7d86b874be597a25acf2275a92f1c1cea0e8cb7e0325b49c595d8
font_01_sfnt_off0000e8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 11184 bytes
SHA-256: 4d8885ae9e6a0f263083f8f70ff290b0417b2e94b5eb1b08f224280b94a7fed4

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