Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37060014fe53fc8…

MALICIOUS

PDF

66.6 KB Created: 2020-11-28 20:29:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3fea64be6bebb4933ccd51ee4031cd5c SHA-1: 1b805765f5ad1ce05d33c76ccb316ea03aec0c53 SHA-256: d37060014fe53fc88a8431d03f2383c9e2c94d8d913b7baeb48fc3cecfbb5423
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection scheme, likely using JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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 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.
  • 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://trafffi.ru/123?utm_term=einstein+ideas+and+opinions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380392/normal_5f9e9424deb97.pdfIn PDF document text
    • https://doluxofaxomivu.weebly.com/uploads/1/3/4/7/134715621/sisufugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382194/normal_5f8f3bb9ad73a.pdfIn PDF document text
    • https://vitedilerag.weebly.com/uploads/1/3/4/3/134344875/tiribumemusikofaxobi.pdfIn PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/273324b7d65fd.pdfIn PDF document text
    • https://rogosibaf.weebly.com/uploads/1/3/4/5/134590501/9e99010.pdfIn PDF document text
    • https://fuketuxe.weebly.com/uploads/1/3/4/4/134495293/rojavaveb.pdfIn PDF document text
    • https://zuzuxaze.weebly.com/uploads/1/3/4/0/134040629/6918560.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/1ca34bf2-1eeb-4740-a90f-76660bd57f42/tovefokuzek.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_off0000ca28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA28 4784 bytes
SHA-256: 6785973d4e617e7505a9efe209eb1698b4b34c6d975267171266a6891e663e0d
font_01_sfnt_off0000da84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA84 10464 bytes
SHA-256: 8739a0d5019beb806d48b3ff6d5806b3906ea64ebfd357ac54180f9fed8759b4

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