Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14bef4bd7ed0419…

MALICIOUS

PDF

31.8 KB Created: 2020-06-09 09:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08f137ccbed6f89fe8239c0e51093d2f SHA-1: a460b5364b911adc0632cc246f9f8c63c4736292 SHA-256: a14bef4bd7ed0419727fc300353f51276638e6fff2a11f0890c0a029b92b8f5c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary purpose appears to be directing users to various external PDF files hosted on different domains. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the extensive link farm suggests a potential for hosting malicious content or engaging in SEO abuse.

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://psktravel.voyagerwebsites.com/uploads/1/3/0/5/130543855/130543855.html#bir+seher+vaktinde+indim+ba%25C4%259Flara+not
    • http://crossngo-production.com/uploads/1/3/1/1/131163725/719de782.pdf
    • http://merrillbrook.com/uploads/1/3/1/8/131872199/niwobofujogez.pdf
    • http://sjminteriors.net/uploads/1/3/0/7/130775590/3852338.pdf
    • http://70-141-74-229.monroeinfo.com/uploads/1/3/0/6/130620366/e42c4c1492cc366.pdf
    • https://buzuboxovova.files.wordpress.com/2020/06/69129690592.pdf
    • https://gujetek.files.wordpress.com/2020/06/47623656305.pdf
    • https://jalelukunor.files.wordpress.com/2020/06/gologulinududab.pdf
    • https://dexubifomuti.files.wordpress.com/2020/06/61424519239.pdf
    • https://tamanalewoja.files.wordpress.com/2020/06/porodobav.pdf
    • https://dolajova.files.wordpress.com/2020/06/98266433159.pdf
    • https://ruxarelofodu.files.wordpress.com/2020/06/13976006689.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_off00004a4d.bin
92c93488a8382267ffef0d472cfd34003d56a6aebe972ad0ee4d2209558b3a47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A4D 13236 bytes

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