Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbd38289c3226f3…

MALICIOUS

PDF

36.9 KB Created: 2020-04-20 10:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fc8ecc9646804529ff4f727b65d9f08b SHA-1: 4dad1f7754c87dd0dcf5b6023a1db586523cdb4c SHA-256: 6cbd38289c3226f382d81b179efd40ab35eedddb20c97338bf2b82d21e0a00d1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are dynamically generated and point to unrelated content, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document's primary function is to redirect users to potentially malicious external sites.

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://rent2ownshop.com/uploads/1/3/0/5/130539645/130539645.html#beauty+and+the+beast+pdf+2017
    • http://crenerds.com/uploads/1/3/0/6/130605212/wusuribeka_mewenamobivipi_zidego_pilifela.pdf
    • http://wordviewministries.org/uploads/1/3/0/4/130476573/4e06db1663356ce.pdf
    • http://welovejimmorrison.com/uploads/1/3/0/6/130639465/zeruvoganekuba-fewatajore-koxalodowo.pdf
    • http://ecoly-rhone.fr/uploads/1/3/0/6/130639452/6174584.pdf
    • http://sophieswellness.com/uploads/1/3/0/4/130476158/musibos.pdf
    • http://wischultimatefitness.com/uploads/1/3/1/0/131071047/rebupetugapok-majadonitopufep-xumajudud.pdf
    • http://beyonddaytona.com/uploads/1/3/0/8/130874237/dedobu_lopun_mojeje.pdf
    • http://www.wrcantabria.com/uploads/1/3/0/5/130551112/sosutuxifuloxonuruw.pdf
    • http://bespokeghi.org/uploads/1/3/0/5/130551247/15caa257adc6a3.pdf
    • http://compunetsolutionsllc.net/uploads/1/3/0/2/130272936/611439.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_off00006794.bin
8f394bee1f3f2e24c8b36cd5edb4782e70a40fb6107041a64094318ada7e20c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6794 8312 bytes

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