Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dbfe958679edcc5…

MALICIOUS

PDF

48.9 KB Created: 2020-04-24 21:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 16a1b7a4a677f4707c7abc3c04938abe SHA-1: 986f7f53dfe106cba02dad466e2e0c49550ad6c0 SHA-256: 2dbfe958679edcc57ef230f4e25dd400b6affff612c43872c0f88731abc0cf4f
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on similar domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content through a network of compromised sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, limiting the analysis of specific execution behaviors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://worldoftrading.net/uploads/1/3/0/4/130436080/130436080.html#declined+with+thanks+cartoon+worksheet+answers
    • http://themuvement.org/uploads/1/3/0/5/130539120/manole.pdf
    • http://siuent.com/uploads/1/3/0/6/130621355/zowabitofasam.pdf
    • http://syscont.org/uploads/1/3/0/4/130476784/fetarejawaw.pdf
    • http://drewwatsonpups.com/uploads/1/3/0/2/130272403/pexusuwopaluduzal.pdf
    • http://myoutdooraccessories.com/uploads/1/3/1/3/131380208/gaxazuxujinid_muxogebudovi_rupujinataz_bitegidedakog.pdf
    • http://ritetrainings.org/uploads/1/3/0/9/130969746/cee1be58ba34.pdf
    • http://delwynoftherealms.com/uploads/1/3/0/6/130640162/9b547.pdf
    • http://sbnewstv.com/uploads/1/3/0/8/130813427/nawajadowebikufiku.pdf
    • http://bizania.org/uploads/1/3/0/5/130550783/4014721.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_off00009431.bin
03376ec5bf86b6217fb202a1f46aa0cd80c25073c2481fa54fe73858ac918f2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9431 8812 bytes

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