Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c3382c2a55a57d…

MALICIOUS

PDF

53.6 KB Created: 2020-04-19 19:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cafa64c59df14b82e391d7d104d99697 SHA-1: c85f81244d3170c1d65313b9c5eea6e4a6a4e6dc SHA-256: 99c3382c2a55a57dae28dcd4753f818343455e1d2f74d8c1198671c4473ee1cc
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The embedded URL 'http://josschouten.eu/uploads/1/3/0/6/130605146/130605146.html#dictionary+english+to+persian+oxford' is likely part of this lure, aiming to trick users into visiting a compromised or malicious domain.

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://josschouten.eu/uploads/1/3/0/6/130605146/130605146.html#dictionary+english+to+persian+oxford
    • http://mjsurveyllc.com/uploads/1/3/1/4/131482939/3c658718.pdf
    • http://vidalautosales.net/uploads/1/3/1/1/131164090/miwugulogazanomem.pdf
    • http://hopsandyeast.com/uploads/1/3/0/7/130738652/dcf6e50.pdf
    • http://thermolog.hu/uploads/1/3/1/0/131070375/vapuveli.pdf
    • http://meaghansnursingportfolio.com/uploads/1/3/1/4/131438888/5930037.pdf
    • http://joroent.com/uploads/1/3/0/6/130605283/wubuleke_fixugasiwifi_nerumegazavufo.pdf
    • http://centenorodriguez.com/uploads/1/3/0/7/130740483/ripogubuvotupero.pdf
    • http://beaverheadelectric.net/uploads/1/3/0/4/130488312/jifexovodilifofu.pdf
    • http://kucanadan.com/uploads/1/3/1/4/131453725/jolatidu.pdf
    • http://theaveragejoescigarstore.info/uploads/1/3/0/4/130483809/2299454.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
stream_004_off000097c7.bin
48d3a0df6a69f6b204d31df7b7256b841822f623dc77391730c4e08124cf9d09		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x97C7 27752 bytes
font_00_sfnt_off00007621.bin
bee2f9c836d6362e30905730060c025a18e9c1aac09d4d77789a5414e4223893		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7621 8936 bytes

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