Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d6b9b602fa3185…

MALICIOUS

PDF

32.0 KB Created: 2020-05-22 23:39:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 9eca6047dad214791dd2a40f86645dd9 SHA-1: b1dfb4355d0920d780f0177d997f025fd168deec SHA-256: e5d6b9b602fa3185386921a05196a886e7b49f28e333a94b5abdf9ae1daa5e55
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, a common tactic for SEO link farms. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a series of linked PDF documents hosted on various compromised websites, likely as part of a phishing or malicious content distribution scheme. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 4

  • 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.
  • 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 http://azerah.trevelle.com/uploads/1/3/1/4/131453241/131453241.html#4+dias+sech+letra PDF link annotation
    • http://cpanel.eyeheartphotography.co.nz/uploads/1/3/0/6/130621754/5607864.pdfIn PDF document text
    • http://jeclemmonscounselor.com/uploads/1/3/1/3/131398582/9781b.pdfIn PDF document text
    • http://insideclay.com/uploads/1/3/0/5/130589218/a5aa19b1be.pdfIn PDF document text
    • http://suncoastbusinessbrokersinc.com/uploads/1/3/0/6/130605167/surikamelu.pdfIn PDF document text
    • http://rustx.io/uploads/1/3/1/6/131606087/bosefojujewedaxoxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52EC 11064 bytes
SHA-256: 369f7d701d45f573bb3403f67e0e8172f2ec8c5d5ba2622d5d844b3c09b2b898

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