Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cdefa9cbf974e7a…

MALICIOUS

PDF

31.4 KB Created: 2020-06-13 01:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36802ed5fc8f955d5b2e75126e63744c SHA-1: 33b88f37e8c0b8b2b27e434ca9163200cce1057d SHA-256: 1cdefa9cbf974e7af302dff6c6887b1c9a91b19a6bfe13ca9f481e8dd29b762b
94 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to domains hosting further PDF files, suggesting a link farm or redirection mechanism. The document body, though partially corrupted, includes text that appears to be a lure, referencing 'Exemple manuel d' activit� particuli'. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://2e2.undesirable.us/uploads/1/3/0/4/130488513/130488513.html#exemple+manuel+d%2527+activit%25C3%25A9+particuli
    • http://electbentucci.com/uploads/1/3/0/3/130379506/e2add6f6c6.pdf
    • http://tkbcleaningservices.com/uploads/1/3/0/6/130605278/nolanonazil.pdf
    • http://okdiscgolf.com/uploads/1/3/1/3/131381553/xufidodemumima-zadog-kenizuvuno.pdf
    • http://seniorcaregivingpreparednesscourse.com/uploads/1/3/0/9/130969505/xanumowaw-bebokitid-dibuvikikapamex-busavifanodax.pdf
    • http://rwbsj.net/uploads/1/3/0/7/130738511/volubumog_segogeforiluzax.pdf
    • http://peonyny.com/uploads/1/3/0/4/130476976/vizonojuk_juwutadilebom.pdf
    • http://danykenny.com/uploads/1/3/0/7/130776336/9ad052dcf757cd.pdf
    • http://cannapetmedz.com/uploads/1/3/0/6/130620971/9a4b24c7ac8d6.pdf
    • https://guzisaka.files.wordpress.com/2020/06/53922290564.pdf
    • https://zigonasoxovu.files.wordpress.com/2020/06/jelafilaz.pdf
    • https://pezuxoni.files.wordpress.com/2020/06/rafamanibolokakiwabuno.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_off00004f34.bin
72aadf4562f945516a046b22f9518060556850b17513e6b21d8d9080859f06ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F34 10532 bytes

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