Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fb7dfd87fb9f97…

MALICIOUS

PDF

32.8 KB Created: 2020-05-30 19:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 44dcffd8da78ac6ac7a4030aafd157e0 SHA-1: 383a41c8fd4798eeba54b9ecc8ce143fd58059b3 SHA-256: 51fb7dfd87fb9f97ec563c2ed3096698c6538c2c911e338b6dafe7e7fdff3c98
96 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, many of which appear to be part of a link farm designed to lure users. The document body, though heavily obfuscated, contains references to these URLs, suggesting a coordinated effort to distribute malicious content. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9862

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://ogc.devsite-1.com/uploads/1/3/1/6/131637658/131637658.html#2012+porsche+panamera+turbo+s PDF link annotation
    • http://visarunclub.com/uploads/1/3/0/7/130738667/5128782.pdfIn PDF document text
    • http://michalindi.com/uploads/1/3/0/8/130814003/telodesekutelor.pdfIn PDF document text
    • http://shawnastouch.com/uploads/1/3/0/8/130874067/kinawuvu-getikigalelev-jitadaromasil-tuforajizalobu.pdfIn PDF document text
    • http://socaltrailruns.com/uploads/1/3/0/2/130289741/46b4c89.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 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_off000055fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55FE 10220 bytes
SHA-256: af78502846c1d4b87625b9841971c528b30ef818074adb73c482c4674544e89d

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