Malicious PDF — malware analysis report

Static analysis result for SHA-256 085ab37bf88e759b…

MALICIOUS

PDF

44.4 KB Created: 2020-04-19 05:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4b3e865825db0720802ea470d3dd23cf SHA-1: ba3e80925c4d7e05f82b1f3cded36f7927888c11 SHA-256: 085ab37bf88e759b02ee01ffc4cdc3a125f7fd0436c303e437b6233d9295f376
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 appear to be part of a link farm designed to direct users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external URLs suggests an attempt to redirect users to phishing or malware hosting sites. No scripts were extracted, but the PDF structure itself is indicative of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://longvalleycreative.com/uploads/1/3/0/7/130776273/130776273.html#avishai+cohen+gently+disturbed+pdf
    • http://heavenlyimagessounds.com/uploads/1/3/0/6/130621004/1251591.pdf
    • http://prestigeapartmentsdublin.com/uploads/1/3/0/6/130605475/povokinu.pdf
    • http://jamaicanjuiceblends.com/uploads/1/3/0/8/130813548/4a06dcd154a318e.pdf
    • http://stayviveproductions.com/uploads/1/3/0/2/130271072/vediw.pdf
    • http://southernsassboutique.org/uploads/1/3/0/6/130620871/ximutubi.pdf
    • http://9imagem.com/uploads/1/3/0/4/130476423/fosutuzobo-bekapos-puzumizufowukug-rokaxafofor.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_off00006b14.bin
8fc71e28f47965c8173eb44447711458e4dd2d94d462bdcb14588f187f04c57a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B14 9492 bytes
font_01_sfnt_off00008e13.bin
9cdd1bdeb88df2fa381b4b4b074be0b4e927d007ca5708bd1c726b91453140c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E13 16836 bytes

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