Malicious PDF — malware analysis report

Static analysis result for SHA-256 e759c95d7c50dba9…

MALICIOUS

PDF

52.8 KB Created: 2020-04-11 07:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f39e1e2c7cc8b38eb985159550ee7d81 SHA-1: 4126d2b3a1efbae885c53ab535cccf62137c2bf0 SHA-256: e759c95d7c50dba9d300161be0f591df4b8ebf197093461e197627d33166a40e
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated with numeric slugs, indicating a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious. The embedded document body text, though partially corrupted, contains a title related to organizational structures and a reference to wkhtmltopdf, suggesting a lure to disguise the malicious intent of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://74-123-77-223.mgwnet.com/uploads/1/3/0/8/130874340/130874340.html#tipos+de+estructura+organizacional+v
    • http://picjosh.com/uploads/1/3/0/2/130272395/wimisurisimita.pdf
    • http://realcoolsite.com/uploads/1/3/0/6/130604349/luxixanupedaka-zomepagugiwode.pdf
    • http://transmotta.org/uploads/1/3/0/6/130621892/wopodabugozinujagu.pdf
    • http://whitefirfarms.com/uploads/1/3/1/0/131071035/zelinirerironako.pdf
    • http://yesteryearpics.com/uploads/1/3/0/8/130813840/3011436.pdf
    • http://hopetechnologies.net/uploads/1/3/0/6/130639581/1605621.pdf
    • http://galwayglazingservices.com/uploads/1/3/0/6/130620823/7601793.pdf
    • http://thecustomerexperiencecenter.com/uploads/1/3/1/4/131483778/vopeg.pdf
    • http://coloradosmortgageexpert.com/uploads/1/3/0/2/130287482/voribaxopipuruve.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_off0000a6d8.bin
3724dc56bb1c54ad1c80568c3a8c100139bcbbae27cb9c15d87dc36bb231cb3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6D8 8468 bytes

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