Malicious PDF — malware analysis report

Static analysis result for SHA-256 396ff0174befd95f…

MALICIOUS

PDF

42.4 KB Created: 2020-06-17 03:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 208881eb6c0d0c73f4ec2a44401ed67d SHA-1: 0172a712bf2144a8eedd099a614267a0c35e0943 SHA-256: 396ff0174befd95fcf00b09bb603e9b886e8a54a62a197dec1fbd13d00c48888
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on domains that appear to be part of a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains references to an 'online english test free answers' lure, suggesting a phishing or social engineering pretext. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous suspicious URLs supports this assessment.

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://coachphilblack.com/uploads/1/3/1/6/131606273/131606273.html#online+english+test+free+answers
    • http://doubleinfinitypixie.com/uploads/1/3/1/4/131407011/8613614.pdf
    • http://newcourtre.com/uploads/1/3/0/4/130476589/busofawal_bugodumabe_zusoxemerigol.pdf
    • http://barndoorgallery.com/uploads/1/3/1/3/131380004/3217013.pdf
    • http://mainstreettrojans.com/uploads/1/3/0/3/130313054/nelokebix.pdf
    • http://rayseldomridge.com/uploads/1/3/0/5/130543648/pudiginivaf_pozowedamozi_dejeni_kuzekifoziw.pdf
    • http://lasquetiliving.com/uploads/1/3/1/4/131408529/diliduviroduj.pdf
    • http://lemongrasswayanad.net/uploads/1/3/1/4/131407008/c9e3a62f409e.pdf
    • http://mail.jubileewellness.org/uploads/1/3/1/0/131070982/96dddfb9b05fe2e.pdf
    • http://mail.napra-forgo.com/uploads/1/3/0/3/130324191/sabuzaniw.pdf
    • http://mail.napra-forgo.com/uploads/1/3/0/3/130324191/sab
    • 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_off00006a1b.bin
beb7ca2aef9d0911a2021e5262049e32d268c4cef7ffefa0e3c343e032843fff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A1B 4824 bytes
font_01_sfnt_off00007a8a.bin
92350f1a3c8e7a1d15c4335f82e587797f025aade8e0aa715d72ede5da157c27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A8A 10220 bytes

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