Malicious PDF — malware analysis report

Static analysis result for SHA-256 f993e7543531dae3…

MALICIOUS

PDF

47.9 KB Created: 2020-04-11 04:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b365271b734eaed8afb3edf7bc58c39e SHA-1: b3d91f87ca809dba2f767eeb095e17517a3947a3 SHA-256: f993e7543531dae31131792f63df3297a2f5f40243be5c6d5cb2bba70efa97e1
92 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, a common tactic for SEO poisoning or directing users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests this behavior. The document body, though heavily obfuscated, contains fragments that appear to be related to exam preparation, likely a lure. No scripts were extracted from this sample, limiting the ability to determine specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 3

  • 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
  • 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://trentriverdesigns.com/uploads/1/3/0/7/130739028/130739028.html#pmp+exam+prep+8th+edition+updated+pd
    • http://auanm.com/uploads/1/3/0/6/130639578/222181.pdf
    • http://darrenroesch.com/uploads/1/3/0/6/130604313/xajutinulifu.pdf
    • http://jessicarosejewelry.net/uploads/1/3/1/4/131483194/6225127.pdf
    • http://kristareiner.com/uploads/1/3/0/6/130604366/muxiwiposogato-bovitalixadidep.pdf
    • http://nomercygiven.net/uploads/1/3/0/5/130590550/e3a21922135ca4.pdf
    • http://rockstarsproductions.com/uploads/1/3/0/7/130775102/xutelobeb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fc2.bin
4a62a9f6bafabda6bc17925960b79f552616f9f9b62f260d4479de7e7ac96a13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC2 9196 bytes
font_01_sfnt_off00009252.bin
3d52fc27d04b8b84b219df719738f768697e09c2050136bc1fe69fcddf4eca6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9252 2652 bytes
font_02_sfnt_off00009bb7.bin
451895f61762ee2c92071758aadde1050fcd1a41f8262062c25ecb60f5c137f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BB7 16340 bytes

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