Malicious PDF — malware analysis report

Static analysis result for SHA-256 09888da751ba77b5…

MALICIOUS

PDF

74.9 KB Created: 2020-04-04 06:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 08a9771d5dba22c709cbf3fe412a224f SHA-1: dfcfd401db5860de637721973d3a3d6fe220b45d SHA-256: 09888da751ba77b5463732bad7b3f7eb2c295d8299f22f8c4ec5c6bac7cad2d4
96 Risk Score

Malware Insights

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

The PDF document contains a deceptive title and numerous embedded links to external PDF files, indicating a likely attempt to manipulate search engine results or host malicious content. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests this behavior, and the ML classifier also flagged the document as malicious. The presence of many external links points towards a malicious link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://eyecarecenterwakeforest.net/uploads/1/3/0/5/130539987/130539987.html#coming+out+on+top
    • http://sidewalkinteractions.net/uploads/1/3/0/9/130969762/vojezopadisinutobuwi.pdf
    • http://twgafc.net/uploads/1/3/0/6/130604724/bb9ca186fe13c7.pdf
    • http://sugarlandpremierroofing.com/uploads/1/3/0/7/130775747/abec3432748.pdf
    • http://rossiternewengland.com/uploads/1/3/0/6/130640182/fuzepuvuxe-nonem-fepazefudivefi-falakefefuta.pdf
    • http://anglohealth.com/uploads/1/3/0/2/130287314/357242.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_off0000feb2.bin
e65f47f5e57bad4a0c8a953481f202398e1179af912b29d64755d86ebe8cdb65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 8352 bytes

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