Malicious PDF — malware analysis report

Static analysis result for SHA-256 793c328f41a2c2c4…

MALICIOUS

PDF

36.7 KB Created: 2020-04-05 15:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3dcc75994d0844838ac0a80eb981fa7a SHA-1: 35830de0a708ca02e8f5d84995bf9f24e4f25b01 SHA-256: 793c328f41a2c2c487110e0d792458a9de3ab45992caee31c747189159b9ddd4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier and contains a large number of embedded external links. The primary attack pattern appears to be SEO spam or a link farm, directing users to various potentially malicious or unwanted websites. The document body contains garbled text and a specific URL, suggesting it's designed to obfuscate its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wildchild.dance/uploads/1/3/0/5/130539022/130539022.html#horseshoe+tear+with+detachment+icd+10
    • http://leclairscloset.com/uploads/1/3/1/4/131437143/befusipubanep.pdf
    • http://kelseycookofficial.com/uploads/1/3/0/4/130488091/5989507.pdf
    • http://roadbook-idtolight.com/uploads/1/3/0/7/130740200/tidexebekinu-xifokogekesu.pdf
    • http://nextwave.technology/uploads/1/3/0/5/130588783/rokenol-bavatetudutaf.pdf
    • http://photoggrafos.com/uploads/1/3/0/7/130739499/lapurenezowefu.pdf
    • http://derrickgardnerphotography.com/uploads/1/3/0/6/130620469/defulegato-tenis-mapugenomafidek.pdf
    • http://baw-rook.com/uploads/1/3/0/6/130621479/1348420.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_off00006749.bin
d77fe8b843f87bec4c6d352bf06f6e200488d9acc0a958424bd79fb2e9ff0ea3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6749 7440 bytes

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