Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90f4f902b9f5336…

MALICIOUS

PDF

44.7 KB Created: 2020-06-16 22:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0881eb6bfedf7b6c820ca8add4672a97 SHA-1: 4980c87c7ee883dc0efe2bf59707682d21cdb4a1 SHA-256: b90f4f902b9f5336e60daf91951702839e0d652d7a3b7c2e893d0b8a0cb9d86f
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a tactic to manipulate search engine results or redirect users to malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of the specific lure.

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://josephsgumboday.com/uploads/1/3/1/3/131379789/131379789.html#hr+function+pdf
    • http://cartooneducation.com/uploads/1/3/0/7/130739904/gafilon.pdf
    • http://webmail.la-rocca.org/uploads/1/3/0/4/130436410/e2b8acf3049d.pdf
    • http://1schoolsystem.com/uploads/1/3/0/2/130271124/butekomuxobubolebi.pdf
    • http://riverrockglassstudio.com/uploads/1/3/0/5/130550910/zudogeme_kupan_zorepijebe.pdf
    • http://valusfitness.com/uploads/1/3/1/4/131483200/e81232b02a1f029.pdf
    • http://thisoklahome.com/uploads/1/3/0/4/130491599/495807.pdf
    • http://serendipityinteriordesign.com/uploads/1/3/0/5/130590139/lotekivimimawu-gubuvo-powukagodi.pdf
    • http://sachikowillis.com/uploads/1/3/1/6/131606588/df4f7f044c5e.pdf
    • http://ssicards.org/uploads/1/3/0/6/130605325/wagesa.pdf
    • http://sydney.awrc.org.au/uploads/1/3/0/6/130604355/7b593c1.pdf
    • http://oportoforever.com/uploads/1/3/0/3/130323727/nidozaputasimuke.pdf
    • http://mfgcsi.com/uploads/1/3/1/6/131607486/tisupuz-xasuvivowuvemug-webevuf.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_off000072ed.bin
301fd7871a0f1df43e41e606a5e50659363936594d036c1cf4b0528953a22f07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72ED 4452 bytes
font_01_sfnt_off00008209.bin
e754171396ba67c4f067e3bf8f6215b026fabc0caf18d3324c4452b59a011ce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8209 10852 bytes

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