Malicious PDF — malware analysis report

Static analysis result for SHA-256 3019da35b6d01746…

MALICIOUS

PDF

49.1 KB Created: 2020-04-30 17:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 32a9925d1a5e664e2b96ff616a565fb6 SHA-1: baca5aae57ca2cb45a9bd9a4d2c98a861af9ada9 SHA-256: 3019da35b6d017465807b4a2d5a8a8ea42e6305b58e6f1d485ccd0e2adcec317
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on similar domains. This behavior is indicative of a link farm or a distribution mechanism for malicious content. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text suggesting it's an 'Acknowledgement template', which is a common lure for phishing or malware delivery.

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://prestige-technologies.net/uploads/1/3/0/2/130273738/130273738.html#acknowledgement+template+word
    • http://mixedmedia.nz/uploads/1/3/1/4/131408415/885dd5542a71c4.pdf
    • http://larissamae.com/uploads/1/3/0/6/130604606/vusubufojazolun.pdf
    • http://villageidoc.net/uploads/1/3/1/6/131637402/4b38818f60f.pdf
    • http://intrachangecoaching.com/uploads/1/3/1/4/131453495/9104330.pdf
    • http://winzdaychild.com/uploads/1/3/0/4/130483872/gonilovo.pdf
    • http://erosrodriguez.com/uploads/1/3/1/6/131637218/wuxumelezokifaj.pdf
    • http://careerelevators.net/uploads/1/3/0/5/130551641/7663154.pdf
    • http://metropcsautoadverts.com/uploads/1/3/0/4/130476912/8010019.pdf
    • http://themagicalcryptofriends.com/uploads/1/3/0/7/130776149/dovigisewadud.pdf
    • http://mayfabindustrial.com/uploads/1/3/0/7/130776523/9615374.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_off0000998f.bin
d3793cbb80bb481e3f40a1d354480446870c8e86f8eabe8429e38e8782c85b46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x998F 7520 bytes

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