Malicious PDF — malware analysis report

Static analysis result for SHA-256 875e37f52d2cc26a…

MALICIOUS

PDF

40.9 KB Created: 2020-04-30 05:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 153c2e2bca34d3ee0f2629060562b592 SHA-1: 7e500ad0a734da51ca4c52cb6201b5e13afaa8c2 SHA-256: 875e37f52d2cc26aded81d2510ab1ebe3b9119eaf1e2c7891040fd197e1ca8b2
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The embedded document body text, while partially corrupted, contains a reference to 'Bahubali movie in hd tamil', likely a lure to attract clicks. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://lisahilts.com/uploads/1/3/1/3/131398140/131398140.html#bahubali+movie++in+hd+tamil
    • http://manahawkinelectric.com/uploads/1/3/0/5/130546076/9353767.pdf
    • http://close2immortality.com/uploads/1/3/0/3/130379928/f02eaea998.pdf
    • http://markanderson.studio/uploads/1/3/0/6/130605255/mobejunetarexewe.pdf
    • http://clearclutter.co/uploads/1/3/0/2/130289247/01d2497dcb.pdf
    • http://lemke-michelspsychotherapy.com/uploads/1/3/0/8/130814471/nimuzimapimi-rupodomawo-wugavejosoboke.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_off000063c8.bin
d41dd49fabdd50862f3ef5e0c53a6f4f999a9eaabdbcf6fe0a6c9c44a5832ab8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C8 7916 bytes
font_01_sfnt_off00008283.bin
32b54217619f9438721b423dc2f4f4da0f78781b0811ea49af2be6b0310ecf56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8283 16164 bytes

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