Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ac985e15e928b8…

MALICIOUS

PDF

58.5 KB Created: 2020-06-05 05:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfb34f79c738c95889d495d4cc4494c3 SHA-1: 98a62487056c59c6b0b69e2243dfd8512a64cc5c SHA-256: a9ac985e15e928b8546bfc5b0d5186742dee1402a60e18b9a5bf2bd6f34a8f32
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The document body, though partially corrupted, contains text related to database creation and mentions 'wkhtmltopdf', suggesting a lure. The presence of multiple PDF links, many pointing to domains with numeric slugs, further supports the link farm heuristic. The ML classifier strongly flagged this PDF as malicious.

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://sacasta.voyagerwebsites.com/uploads/1/3/0/8/130873983/130873983.html#crear+base+de+datos+en+access+avanza
    • http://berger-blancsuisse.fr/uploads/1/3/0/8/130814644/tuwibasepunagaf_jemezoweka_pijutemotiso.pdf
    • http://sergiolab.org/uploads/1/3/0/3/130323277/tebikiwapivunemix.pdf
    • http://meredithharker.com/uploads/1/3/0/5/130588822/mepugajonu.pdf
    • http://a-plus-medical-supplies.com/uploads/1/3/1/8/131871710/9133959.pdf
    • http://sacasta.voyagerwebsites.com/uploads/1/3/0/8/130873983/terms.html
    • http://sacasta.voyagerwebsites.com/uploads/1/3/0/8/130873983/dmca.html
    • http://sacasta.voyagerwebsites.com/uploads/1/3/0/8/130873983/policy.html
    • https://kejijewuna.files.wordpress.com/2020/06/59159177514.pdf
    • https://nubemirikit.files.wordpress.com/2020/06/kunolawimibatosi.pdf
    • https://nujonadaxib796972992.files.wordpress.com/2020/06/gesesowurilatijukewuji.pdf
    • https://motajixug.files.wordpress.com/2020/06/lesera.pdf
    • https://dufamisiril.files.wordpress.com/2020/06/gasiraz.pdf
    • https://pogunuji.files.wordpress.com/2020/06/lofuvoxojekadaxutuzus.pdf
    • https://tafibenula.files.wordpress.com/2020/06/vimobepulejogixar.pdf
    • https://paxenobotib.files.wordpress.com/2020/06/89812670204.pdf
    • https://dabuxegidul.files.wordpress.com/2020/06/gatetinuviverabijani.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_off0000b7d1.bin
283f2f6a319d9049a30c76ac9c10a684b81da5e3fa57705268ddb4f9b3b495b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D1 11680 bytes

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