Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d67f72ff08880bc…

MALICIOUS

PDF

43.4 KB Created: 2020-03-26 01:38:55 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eabc51fad18963871f5ac38834b53a94 SHA-1: 3e67fc98233484f05764ba8eb57cc7113b05f651 SHA-256: 0d67f72ff08880bc501b1659ada95a9b93f5d54c08a4afd5b158f5025e431d0e
96 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, embedding a large number of external URLs. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous links, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful content. While no scripts were explicitly extracted, the embedded URLs are the primary indicators of malicious intent.

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://cfwclearningcenter.org/uploads/1/3/0/2/130270905/130270905.html#usps+bound+printed+matter+rates
    • http://www.landlegacies-org.fogdrip.com/uploads/1/3/0/2/130289610/sezaze.pdf
    • http://kansascityskateboarding.com/uploads/1/3/0/7/130776304/jasifutawug_divufuzeka_gupotiv.pdf
    • http://autodiscover.hiltonheadbtar122.com/uploads/1/3/0/6/130621303/sosevekumin_gutin_ronevemit.pdf
    • http://www.38babycare.com/uploads/1/3/0/7/130774970/dagedopi.pdf
    • http://elitefemalefitness.com/uploads/1/3/0/4/130483690/8480291.pdf
    • http://www.warriorworksllc.com/uploads/1/3/0/5/130590363/jidebujifiwaro.pdf
    • http://mail.phenixid.com/uploads/1/3/0/5/130589135/838e371f9.pdf
    • http://elitepartnersllc.net/uploads/1/3/0/4/130489371/9163915.pdf
    • http://grian.cz/uploads/1/3/0/9/130968958/sirotal.pdf
    • http://thebridgeyouthcenter.org/uploads/1/3/0/3/130323517/c6af4888dcbfd8.pdf
    • http://informationsystemdynamics.net/uploads/1/3/0/6/130604411/8889314.pdf
    • http://ryugroup.com/uploads/1/3/0/9/130969587/3145434.pdf
    • http://newriverknockouts.org/uploads/1/3/0/4/130475881/6231946.pdf
    • http://seaplanediving.com/uploads/1/3/0/4/130476069/dd2d4102505c7d1.pdf
    • http://adairwatkins.com/uploads/1/3/0/9/130969510/7932656.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ab7.bin
d677855fd5200c5db8fd15385b4310cbbda1b04624de4e1bba3270c9dbfafc3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB7 7864 bytes
font_01_sfnt_off00008937.bin
10e2fcbd2e83c19a6fa5bddbd11067b8e798001af0ea21fab5811614680d5277		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8937 16080 bytes

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