Malicious PDF — malware analysis report

Static analysis result for SHA-256 c294dde4311879f6…

MALICIOUS

PDF

38.4 KB Created: 2020-04-07 15:39:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f98d233856601cfaca2185ea406289ab SHA-1: 0495154d83e23e3d8f7700984b59d44b1052b97b SHA-256: c294dde4311879f6e4c8145e8c86539247fc8a0ac5c1174cf0c35e6637b76402
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 User Execution

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to a vast collection of other PDF documents hosted across various domains, likely for SEO spam or to distribute further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://brioinvestments.com/uploads/1/3/0/2/130289763/130289763.html#fertile+crescent+blank+map
    • http://drlesliejenkins.com/uploads/1/3/0/8/130874658/jetefefukajanow_fiduwif_junas_dakexobusubobup.pdf
    • http://greatridemotors.com/uploads/1/3/1/3/131384359/muwatad.pdf
    • http://letsparti.org/uploads/1/3/0/7/130776131/laguzugejega_murerak.pdf
    • http://lucieshearerart.com/uploads/1/3/0/4/130483961/e201075.pdf
    • http://danielpeco.com/uploads/1/3/1/4/131438067/jomajagopenatigafu.pdf
    • http://operaino.com/uploads/1/3/0/5/130545096/xubadefezadeni-noxizejop.pdf
    • http://dlilys.com/uploads/1/3/0/8/130874189/784366.pdf
    • http://insightkidzcare.com/uploads/1/3/0/6/130620859/boxejonuleze.pdf
    • http://grandmatilly.com/uploads/1/3/1/1/131164320/9023033.pdf
    • http://das-uk.eu/uploads/1/3/0/3/130313700/zozugele.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ed8.bin
8b2ffaa9a15bb6246d16b22f0e1bc7c726a961face0c1235e8d13ed5a8172192		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED8 7756 bytes

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