Malicious PDF — malware analysis report

Static analysis result for SHA-256 695b3aee7574c99d…

MALICIOUS

PDF

39.5 KB Created: 2020-05-20 09:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5fcd7d84fdc62bcf687fff6bb8d2fcf SHA-1: acdd55a062754dac7948411cf30deca6e08018b7 SHA-256: 695b3aee7574c99d49596cd90fe1d13ce6c39aaa2c423cb01ed3bfde53684422
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links to various domains, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the embedded URLs suggest a phishing or content distribution scheme, potentially leading to further malicious downloads or SEO spam.

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://aramintaschild.com/uploads/1/3/0/4/130435596/130435596.html#puntos+de+partida+answers
    • http://newstarmultitech.com/uploads/1/3/1/4/131408432/pegisizanexaguzagez.pdf
    • http://arifullmer.com/uploads/1/3/1/4/131453086/lunefinap.pdf
    • http://nastockdogassociation.com/uploads/1/3/1/4/131410370/7415247.pdf
    • http://daves-woodcrafts.com/uploads/1/3/0/6/130620420/6ea661799.pdf
    • http://freelivinco.net/uploads/1/3/1/0/131070226/rojolulepis.pdf
    • http://zstones.com/uploads/1/3/0/6/130639626/7663088.pdf
    • http://kumuhokuakana.org/uploads/1/3/0/6/130605166/1154424.pdf
    • http://treasureoftheandes.com/uploads/1/3/1/3/131379373/5072488.pdf
    • http://caregen.us/uploads/1/3/0/7/130740211/3187332.pdf
    • http://michiganlibertyrising.com/uploads/1/3/0/3/130324206/dekadup.pdf
    • http://nolimitationsyouthservices.org/uploads/1/3/0/6/130605111/kobujadomutepul.pdf
    • http://lionsawakening.com/uploads/1/3/0/5/130588622/xumemiderisesalosexe.pdf
    • http://gulfshrimpretail.com/uploads/1/3/1/4/131453682/mupojuveviv.pdf
    • http://killencars.com/uploads/1/3/1/6/131636627/sutitorazov-fakaxexegewones-zunukulovivido-nuterisezafoke.pdf
    • http://sundaysewingpatterns.com/uploads/1/3/0/7/130776150/156e42ac71efb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a65.bin
3cd36c75c722b0faca288561963931a9e22a44441913a8dc94ac9094e80532b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A65 12188 bytes

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