Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64d9003333998b7…

MALICIOUS

PDF

31.7 KB Created: 2020-05-31 17:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa353ebaa36b5b1ec414b3c78e88ee08 SHA-1: 4384c34334e71c1cb0424ed72367af2ab8d743cf SHA-256: c64d9003333998b79409c029d1ab19c5491616aef9b6eefc95a961ec680d531a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links to various domains, many of which appear to be part of a link farm. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of SEO-optimized PDF files, likely to serve as a landing page for further malicious activity or to distribute malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://8r334.bpmtc.com/uploads/1/3/0/4/130489247/130489247.html#haritada+kaybolmak+sorular%25C4%25B1+e%25C4%259Fitimhane
    • http://uwsc.net/uploads/1/3/0/6/130639456/kititotirufuxuj-busog-xepixunonifax.pdf
    • http://jpadpublishing.com/uploads/1/3/0/3/130379316/5616092.pdf
    • http://mx.saraalawadhi.com/uploads/1/3/0/7/130775623/51d7fca343e8c.pdf
    • http://luckypierredlr.org/uploads/1/3/1/8/131872017/6c5cba.pdf
    • http://outsourceadministrative.com/uploads/1/3/1/4/131407155/63d9970b3.pdf
    • http://bel-airmaritime.com/uploads/1/3/0/2/130289096/bovegixesowimawovamo.pdf
    • http://hostmaster.lunamansions.com/uploads/1/3/0/2/130289246/benoso.pdf
    • http://ninjahomeleads.com/uploads/1/3/0/7/130775378/9455927.pdf
    • http://thecodefitness.org/uploads/1/3/0/6/130639664/5396238.pdf
    • https://kekebig.files.wordpress.com/2020/05/taduzigan.pdf
    • https://tesodufow.files.wordpress.com/2020/05/47575239563.pdf
    • https://potataz.files.wordpress.com/2020/05/garewejit.pdf
    • https://dixifuwegor.files.wordpress.com/2020/05/jeramusagajil.pdf
    • https://gamiluvas.files.wordpress.com/2020/05/jijugezevojivulud.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_off00004e6f.bin
8d82b7d4e734210c24fffa017a3ef7156cb8b683ea7219de2d7782261094627a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E6F 10988 bytes

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