Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45639e9d54404b4…

MALICIOUS

PDF

60.8 KB Created: 2020-06-01 08:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e91afef3a23e1bd18424b1203635a248 SHA-1: 12f87aa873c021d9f36a156a1f702d61db55fdd4 SHA-256: e45639e9d54404b4e73c50ddf9815c51e6316f6e61e8eb5d33c47e7f3e62cb4b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to a 'Cancionero latino para guitarra pdf' and the wkhtmltopdf application, suggesting a lure. The primary malicious URL identified is http://vahotclubs.gammaxiques.org/uploads/1/3/0/5/130588733/130588733.html#cancionero+latino+para+guitarra+pdf. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://vahotclubs.gammaxiques.org/uploads/1/3/0/5/130588733/130588733.html#cancionero+latino+para+guitarra+pdf
    • https://xibojiwox.files.wordpress.com/2020/05/nafanipef.pdf
    • https://badumazu.files.wordpress.com/2020/05/94675712333.pdf
    • https://buluzoti.files.wordpress.com/2020/05/kokarobeti.pdf
    • https://dasawiduved.files.wordpress.com/2020/05/lijubosopa.pdf
    • https://murimesoxaj.files.wordpress.com/2020/05/wupomejopaxaguxap.pdf
    • https://jerurig.files.wordpress.com/2020/06/gaziliwigikerofas.pdf
    • https://tamitiji.files.wordpress.com/2020/06/rezeluxagijawebifukage.pdf
    • https://sabirixanep.files.wordpress.com/2020/06/61559621612.pdf
    • https://wuniwowet.files.wordpress.com/2020/06/2856915146.pdf
    • https://kiwekesumi.files.wordpress.com/2020/06/24214717663.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_off0000a4a5.bin
ab7b6ab6f8af8ba9bbde945a2756f3a1e8d71090961d3b71f45dd8056d0ca858		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4A5 13676 bytes
font_01_sfnt_off0000ce28.bin
66df3e8104ab1f3d93fdc9fb25a38f412b6aebf766cb7880c0b4de99e01a83a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE28 17272 bytes

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