Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d0743d57504ef82…

MALICIOUS

PDF

38.8 KB Created: 2020-05-14 12:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b1a02b8141773813a75bc83260b27109 SHA-1: 2a3a1e3ef3035a4c6496851f2e8a5211a511fc2b SHA-256: 0d0743d57504ef82523ce1042ea2fcb816be233514af4d7f48c3131f94014948
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic identified a mass of external PDF links. While no scripts were explicitly extracted, the presence of numerous suspicious URLs suggests the document's primary purpose is to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://brandstormpromotions.net/uploads/1/3/0/5/130588698/130588698.html#alagey+alagey+album+song+free
    • http://salinaschurchofgod.org/uploads/1/3/0/7/130775127/selosuf-xaxegope-lowekebugujif-naziruxefibuxi.pdf
    • http://hiddenelegancedesigns.com/uploads/1/3/0/6/130621096/015a72.pdf
    • http://happygrassstudio.com/uploads/1/3/1/4/131438260/1020861.pdf
    • http://sevoparis.fr/uploads/1/3/0/7/130775256/738583.pdf
    • http://gangotropis.net/uploads/1/3/0/9/130969110/buxunif.pdf
    • http://nsanegriplegendcars.com/uploads/1/3/1/0/131069887/478609.pdf
    • http://savannahsmedicalmassage.com/uploads/1/3/1/1/131163564/4945644.pdf
    • http://kristilscosmetics.com/uploads/1/3/0/4/130489539/kabogulatowowivotuju.pdf
    • http://eamassociation.com/uploads/1/3/0/6/130604973/8355748.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off0000568d.bin
a840a76fda19cbc44f0e1207107e16e3fb5303848178e8cb663fddad66d0b4e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x568D 10660 bytes
font_01_sfnt_off00007b1c.bin
5ec139a263af45d7cbac1bc1a000173eb4e7f97797aba0f35ce2e37505b4886e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1C 16116 bytes

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