Malicious PDF — malware analysis report

Static analysis result for SHA-256 c685334764eda9ab…

MALICIOUS

PDF

37.3 KB Created: 2020-06-15 22:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 090a71786a71b9246e202373eb76e4f0 SHA-1: ed3e5a19da2962b3e7ad45ffa8584e8c90dc1bf1 SHA-256: c685334764eda9ab5805c0f8938f4b765be8ce6defdfdea09612759a45b9822b
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to unrelated domains, indicating a link farm or SEO spam tactic. The document body, though partially corrupted, contains text related to health exercises and mentions the authoring application, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm attack pattern.

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://adsl-63-204-18-49.benefitplans.org/uploads/1/3/0/8/130813364/130813364.html#exercise+for+lung+cancer+patients
    • http://lockpharmaceuticalconsulting.com/uploads/1/3/0/5/130589431/nizikip_tanefulanedeb_temineligav.pdf
    • http://fssgroup.org/uploads/1/3/1/8/131857278/8523867.pdf
    • http://suburbanpokertour.com/uploads/1/3/1/0/131070327/a2c09a960.pdf
    • http://derinotoedirne.com/uploads/1/3/0/8/130874204/7e064a597.pdf
    • http://cannapetmedz.com/uploads/1/3/0/6/130620971/9a4b24c7ac8d6.pdf
    • http://server65123.misscarols.com/uploads/1/3/0/4/130483852/gefiluve.pdf
    • http://poppinpioneervalley.com/uploads/1/3/1/0/131071063/dc73b7bd9d0ed.pdf
    • http://ssaitravel.voyagerwebsites.com/uploads/1/3/0/4/130488152/cea7956803.pdf
    • http://mail.yourimmobile.de/uploads/1/3/0/6/130639546/pujovabezu.pdf
    • http://theralstoncreekco.com/uploads/1/3/0/8/130814232/d198e1e7.pdf
    • http://server.yeah14.net/uploads/1/3/0/8/130814216/zijir-povegorav-vazikevopeb.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_off00006773.bin
eb7fa710aa65ba5a912b85dd1d9d15eb83953fb4a79f4f9dfd31ae1782c8d768		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6773 10000 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.