Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8bd8be9dcad547…

MALICIOUS

PDF

29.8 KB Created: 2020-05-14 06:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eb765867a2d3856b9257206644d4f6a2 SHA-1: 0e39c66c58e00cda83b7b6bf673fc1a548b41f22 SHA-256: 6e8bd8be9dcad547d1ddb8591f39dc5365a636b50010289bf189774a7e2c6e68
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to domains structured like content farms or link farms, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of many external links indicates a potential phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://sexpositiveboston.club/uploads/1/3/0/6/130639349/130639349.html#adendorff+catalogue+2019+pdf
    • http://anen-ai.com/uploads/1/3/0/8/130874125/vufotexiwawozodari.pdf
    • http://lgmobilehomemover.com/uploads/1/3/0/4/130477633/tamopetaxu.pdf
    • http://potsdevin.com/uploads/1/3/1/3/131379115/8631640.pdf
    • http://hedo-switch-hitters.com/uploads/1/3/0/8/130814408/3025316.pdf
    • http://20180509.xyz/uploads/1/3/0/4/130488251/kanezaniged.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000488f.bin
201594f55d38231668122cb33bf4454d3ad875450aed744134e59fb372f19aa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x488F 10244 bytes

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