Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa70c74fbb803672…

MALICIOUS

PDF

40.4 KB Created: 2020-04-07 12:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d1ba155845fd53877976a11171d31777 SHA-1: b5369f8253add5007ae9d7707ea0bd3671ad1ce4 SHA-256: fa70c74fbb80367202cf9bc1597a9380df4e526ed95acdd808ac1a95c47d7e64
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of external links, many of which appear to be SEO-driven lures. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that likely lead to malicious content or further stages of an attack. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://pintexsolution.com/uploads/1/3/0/4/130488432/130488432.html#bosch+glm+40+laser+distance+meter+40+m
    • http://lovehopedine.org/uploads/1/3/0/5/130588650/8837251.pdf
    • http://zorgdoel.com/uploads/1/3/0/8/130813483/5499040.pdf
    • http://guyerfoundation.org/uploads/1/3/0/3/130313643/c1594581.pdf
    • http://seaspelldestin.com/uploads/1/3/0/7/130739326/pigulusikoz_jodatugo.pdf
    • http://izyandoly.com/uploads/1/3/0/7/130738835/3549705.pdf
    • http://su-tzaiyin.com/uploads/1/3/1/1/131163777/2207520.pdf
    • http://farmstofamiles.com/uploads/1/3/0/6/130621530/xibokozajorowo.pdf
    • http://lgipowerwashing.net/uploads/1/3/0/6/130604675/fitov.pdf
    • http://animalbehaviourcoaching.net/uploads/1/3/0/8/130874475/01f0e8dbf56.pdf
    • http://beautifiebutterflys.org/uploads/1/3/0/6/130639209/b3e300ef04e2.pdf
    • http://sonrisasparadios.org/uploads/1/3/0/8/130814584/b8ad729712776.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eac.bin
9ea9d915a28d798f29094e918c0782e5d73e020ae603e80c87f341c5d21f1477		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAC 8192 bytes
font_01_sfnt_off00007e94.bin
fb31025025499a0fb01c3c1bd89e32baf051e66ef536a35089523545b6160756		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E94 16248 bytes

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