Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7f03ec12e841fd…

MALICIOUS

PDF

40.8 KB Created: 2020-06-05 01:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ad284aabe1f00df306b8b56d94bcd8d SHA-1: 2f5fc2bf5072f103033fccc4a2f0a4f1d85b0239 SHA-256: bc7f03ec12e841fd4745106e3effadf718322ebb3b74a8bda329988899e6fe6b
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO abuse tactic. The ML classifier strongly indicated maliciousness. The document body contains text related to '2018 audi q5 reviews' and metadata indicating it was generated by wkhtmltopdf, which can be used to create malicious PDFs. The primary attack pattern involves directing users to a multitude of external URLs, likely for phishing or malware distribution.

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://mdmagazine.net/uploads/1/3/1/4/131454216/131454216.html#2018+audi+q5+reviews
    • http://hocobo.com/uploads/1/3/1/3/131384470/3036678.pdf
    • http://meteorite-village-happytour.com/uploads/1/3/1/0/131070476/6068975.pdf
    • http://gloewenphoto.com/uploads/1/3/0/7/130775660/238213f.pdf
    • http://easydigearthworks.com.au/uploads/1/3/1/1/131164128/wuriluk.pdf
    • http://beautiufulhealingart.com/uploads/1/3/0/5/130551994/nesafudaz-foteta-lexixaze.pdf
    • http://mdmagazine.net/uploads/1/3/1/4/131454216/terms.html
    • http://mdmagazine.net/uploads/1/3/1/4/131454216/dmca.html
    • http://mdmagazine.net/uploads/1/3/1/4/131454216/policy.html
    • https://nedepiru.files.wordpress.com/2020/06/posisoxurejijebezo.pdf
    • https://pobizabaj.files.wordpress.com/2020/06/jebezop.pdf
    • https://fufebizobaga557495470.files.wordpress.com/2020/06/sudibesisefujakek.pdf
    • https://tarareg.files.wordpress.com/2020/06/12110813914.pdf
    • https://fasidulav.files.wordpress.com/2020/06/63866283349.pdf
    • https://dipenafuvepe538297139.files.wordpress.com/2020/06/junewololajasiriz.pdf
    • https://xininew948096142.files.wordpress.com/2020/06/bikenajimuwajam.pdf
    • https://pomurulive.files.wordpress.com/2020/06/54388647575.pdf
    • https://zugurugebi.files.wordpress.com/2020/06/98796008397.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_off0000724a.bin
f5aea3f370e9faf5541bc025c664dd2ea2c712581f9067ad86c09b87dbb37bd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x724A 10928 bytes

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