Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebe4445b76339d5e…

MALICIOUS

PDF

55.0 KB Created: 2020-04-07 08:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ea8e167e69a485709e40a065ac8b798c SHA-1: fea6e27711b36ef8ed6f1098fdea5ac8032b1866 SHA-256: ebe4445b76339d5e373ece6d533c36bf651fe0205b35ab96c6b905f96871e1df
96 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious with high confidence. It contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or SEO poisoning tactic. These links likely lead to malicious content or phishing pages. The document body contains obfuscated text and references to the generation tool 'wkhtmltopdf', further indicating a non-legitimate purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://iroquoiscafe.com/uploads/1/3/0/7/130739090/130739090.html#4th+derivative+of+cos+x
    • http://lourapleyinteriors.com/uploads/1/3/0/6/130604341/lobefomuzav-pavilog-sefepurezozif.pdf
    • http://wallofartdesign.com/uploads/1/3/0/7/130738806/pikode-xoligewe-kesukiban.pdf
    • http://starting15.com/uploads/1/3/0/7/130776385/4d28c0e2.pdf
    • http://cellfixtexas.com/uploads/1/3/1/0/131070489/1280680.pdf
    • http://pax-roo.com/uploads/1/3/1/1/131163856/nopubigexebol.pdf
    • http://palouseportraits.com/uploads/1/3/0/7/130738964/bilatot.pdf
    • http://masbridge.net/uploads/1/3/0/3/130379063/5692017.pdf
    • http://beadmad.com/uploads/1/3/0/8/130813143/fbbbaf9a76e7.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_off00009850.bin
9dfd830c1bad98de5d728bcfd482f5e371f412586866b52d96b2e1c463177edf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9850 9276 bytes
font_01_sfnt_off0000bbb3.bin
3e9a9dfb40a01f9f7c9c545b28ba37f1de74591f2b47bc69a9983f40f3f3ebd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB3 16080 bytes

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