Malicious PDF — malware analysis report

Static analysis result for SHA-256 754c237376e66cf3…

MALICIOUS

PDF

33.7 KB Created: 2020-04-04 10:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 19d58c560c621797b4f16be803d32896 SHA-1: 6a9ca036ea41e7a21192a68b800de89dbc41426f SHA-256: 754c237376e66cf35d23f43d73ed2ba205f8b3560463aad868644b09ed3eac37
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files with numeric slugs. This pattern is indicative of a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URLs suggests an attempt to redirect users to potentially harmful content or to host further malicious payloads. No scripts were extracted, but the PDF structure itself is suspicious.

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://aqueenwithpurposeshop.com/uploads/1/3/0/8/130813784/130813784.html#the+way+of+kings+audiobook+youtube
    • http://fastparcel.net/uploads/1/3/0/8/130814341/5248949.pdf
    • http://1159design.net/uploads/1/3/0/4/130476045/9e8bca68ed8a.pdf
    • http://virtuebotanicalcreations.com/uploads/1/3/0/8/130813546/bisum.pdf
    • http://heartburnrecords.com/uploads/1/3/1/3/131383998/kezunegozux.pdf
    • http://btlcoregon.org/uploads/1/3/1/4/131406528/fovodefubumejojodalo.pdf
    • http://punchitperformance.com/uploads/1/3/0/4/130490056/1147974.pdf
    • http://carlkatz.com/uploads/1/3/0/7/130775806/c396e116.pdf
    • http://myhigh4.com/uploads/1/3/0/4/130483279/4c3781f50b31543.pdf
    • http://landricscustomsndip.com/uploads/1/3/0/7/130739088/dobar-maruseva.pdf
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b27.bin
c967f008c0d16f1606d4960f189137e1647a954f78370a020252b5d13a19516d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B27 7508 bytes

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