Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21da592fce951a6…

MALICIOUS

PDF

34.8 KB Created: 2020-04-15 05:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2026-05-09
MD5: a41054c950af43722c4d49463d55e8d1 SHA-1: 3cf4a3522f0e1ce7c7c0fe2a662fd3117434d60a SHA-256: b21da592fce951a6575956d6667bfca97620694f9f2ad1cfebd758d3947c0d7c
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior, indicating a likely attempt to drive traffic or distribute further malware. The ML classifier also strongly suggests maliciousness. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://toafreshstart.net/uploads/1/3/0/5/130551488/130551488.html#conclusion+industrial+training+report+example PDF link annotation
    • http://mobilespekladie.com/uploads/1/3/0/9/130969553/835aa2a46d.pdfIn PDF document text
    • http://mimimadeitjs.com/uploads/1/3/0/2/130272328/8185390.pdfIn PDF document text
    • http://musigep.org/uploads/1/3/0/5/130545421/rowijezade-supajo-novutej.pdfIn PDF document text
    • http://metalworksrestorations.com/uploads/1/3/1/3/131380915/135233.pdfIn PDF document text
    • http://weemilah.com/uploads/1/3/0/5/130589199/4751368.pdfIn PDF document text
    • http://travel-taste-explore.com/uploads/1/3/1/0/131070506/ad1e8d.pdfIn PDF document text
    • http://compileacademyfootballclub.org/uploads/1/3/0/4/130477890/jizafuvow.pdfIn PDF document text
    • http://livestrongerllc.com/uploads/1/3/1/3/131381036/8649975.pdfIn PDF document text
    • http://lifemadehappy.com/uploads/1/3/0/4/130491599/pidiwole.pdfIn PDF document text
    • http://joyfulpieces.net/uploads/1/3/0/7/130776100/7336570.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

Related samples 1

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_off000062a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A4 7312 bytes
SHA-256: df2f5eb788c12169ce93bf0dca151bc48a25565f0f098d21a3ad8776c1bb356a

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