Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a75465d5d390a1…

MALICIOUS

PDF

41.4 KB Created: 2020-04-15 08:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c6bee36d40bc689aef9c8c2b55696482 SHA-1: f4c71bf6fda316a51b012aa73681e2596750fc72 SHA-256: a6a75465d5d390a1b41ee3fac14736669ae7c95d5c72808d5739aec28fa7b3e1
94 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, containing a large number of external links to various PDF files hosted on different domains. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains a URL that aligns with the heuristic findings, suggesting a potential lure for users to access these external resources, which may host further malicious content or phishing attempts.

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://smokin.tires/uploads/1/3/0/6/130604377/130604377.html#prepositions+worksheets+for+grade+7+with+answers
    • http://standtallcreations.com/uploads/1/3/0/7/130776358/9679775.pdf
    • http://botanicababalu.com/uploads/1/3/0/4/130476327/rifibowut.pdf
    • http://www.heartminneapolis.com/uploads/1/3/0/6/130620677/lijaxeba.pdf
    • http://drdavidniederkohr.com/uploads/1/3/0/6/130639312/demivurenib_kituruwodu_zejobogapini.pdf
    • http://conclusr.com/uploads/1/3/1/4/131437756/rekotirudikozad-momixetefe-rexumitufe-lunosiwokefaka.pdf
    • http://rockinnebrewing.com/uploads/1/3/0/5/130588692/6402584.pdf
    • http://cohzlab.com/uploads/1/3/0/5/130546244/farebabiwab.pdf
    • http://disabilityresponse.com/uploads/1/3/1/4/131438642/9091482.pdf
    • http://murraysfools.com/uploads/1/3/1/4/131408502/munuku.pdf
    • http://cmenclosures.com/uploads/1/3/0/6/130639845/b59870854.pdf
    • http://mayberryberners.com/uploads/1/3/0/6/130639786/vojexen-lupuxopekazere-nadulak.pdf
    • http://support-de-facturation.net/uploads/1/3/0/7/130740349/baxanoga.pdf
    • http://rosalinds-creations.com/uploads/1/3/0/8/130874377/2606611.pdf
    • http://rayburnsoccer.com/uploads/1/3/0/2/130272234/rigipebevopa-xezax-simarif.pdf
    • http://fanastynoveltysuperstore.com/uploads/1/3/0/5/130540155/rubeletexulaboj.pdf
    • http://rosalinds-creations.com/uploads/1/3/0/8/130874377/
    • 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_off00007976.bin
0732c14871e9394485f4385758f20bb2f2ebd6621d5d457eca9c89ec16333500		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7976 8044 bytes

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