Malicious PDF — malware analysis report

Static analysis result for SHA-256 d483646d2e53cd79…

MALICIOUS

PDF

74.4 KB Created: 2021-03-26 14:02:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6574916ba914ae6b892f40caddd4bf9a SHA-1: 98ebf877602805ec61a2b19b50cd4a8b127e793c SHA-256: d483646d2e53cd791d1712e831b3214bc3981e8e38981e27b652e16c0cb673b8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=aahat+tv+serial+episode PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389820/normal_602edc1a18b95.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/zilutopunimujukumimin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405195/normal_5fde8f8b22ca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421970/normal_605d936ebfd6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_604da3b135a96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388181/normal_6006f1dc2905a.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/48024679224.pdfIn PDF document text
    • https://cdn.sqhk.co/puxobaku/7hcbgfL/gugomolaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456134/normal_5fd894dc6ae9b.pdfIn PDF document text
    • https://rekasefuwe.weebly.com/uploads/1/3/0/9/130969231/9737608.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/d9djeTE/gipozuzodeduwowasitak.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/hgEii37/41240989057.pdfIn PDF document text
    • https://tonuvufew.weebly.com/uploads/1/3/1/4/131438708/mezatefove.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462038/normal_5ffadb73df053.pdfIn PDF document text
    • https://cdn.sqhk.co/fudimesa/j0kuix9/jozefabelenon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://neguxonef.rf.gd/xudiguwep.pdfIn PDF document text
    • http://jokuletufale.epizy.com/rulivunowijoti.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_off0000e627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 5096 bytes
SHA-256: 3b824cb879744b19792322697e2594048c97c4ac7b9093808d4977c68a39030f
font_01_sfnt_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 10888 bytes
SHA-256: 8731e26fdfa202e0591f9281d3becc4e6d3d67f83ff2fbfc9b6afadb24c9c12d

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