Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb704ca2b24da316…

MALICIOUS

PDF

35.8 KB Created: 2020-06-05 09:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bfad722318cb2700a0ab1d281c28564 SHA-1: f7867fc6d93f05be333ea9e2a621a1154963243b SHA-256: fb704ca2b24da316e02670618ff80311cb2ab97c8cea3efd5ae761109e9dc7cc
96 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier as malicious. It contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, which suggests a link farm or redirection tactic. The primary external URI points to 'http://clinicgeek.org/uploads/1/3/0/9/130969431/130969431.html#dirsek+koltuk+de%25C4%259Fne%25C4%259Fi+vs+koltuk+alt%25C4%25B1', and other similar URLs were extracted, indicating a potential phishing or malware distribution attempt.

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://clinicgeek.org/uploads/1/3/0/9/130969431/130969431.html#dirsek+koltuk+de%25C4%259Fne%25C4%259Fi+vs+koltuk+alt%25C4%25B1
    • http://impactmesh.net/uploads/1/3/0/4/130476148/7673c6.pdf
    • http://integritycostconsultants.com/uploads/1/3/1/6/131606111/623c7ec.pdf
    • http://summitatallsaints.com/uploads/1/3/1/8/131856125/97a00e.pdf
    • http://trustedyardservices.com/uploads/1/3/0/6/130639160/08e2825e7e2e.pdf
    • http://muchfamily.com/uploads/1/3/0/3/130323229/nuxepejesazibos.pdf
    • http://atbtackle.com/uploads/1/3/0/5/130539449/9951470.pdf
    • http://4pp7d.bpmtc.com/uploads/1/3/1/4/131407135/kavadimutixef.pdf
    • http://clinicgeek.org/uploads/1/3/0/9/130969431/terms.html
    • http://clinicgeek.org/uploads/1/3/0/9/130969431/dmca.html
    • http://clinicgeek.org/uploads/1/3/0/9/130969431/policy.html
    • https://bixadusumibo.files.wordpress.com/2020/06/80028313892.pdf
    • https://lerisexiw.files.wordpress.com/2020/06/suxavililazejubudiju.pdf
    • https://gozezade421546286.files.wordpress.com/2020/06/65080283000.pdf
    • https://fisiguwinaf.files.wordpress.com/2020/06/5417885980.pdf
    • https://pixapivuba.files.wordpress.com/2020/06/27236168191.pdf
    • https://guzisaka.files.wordpress.com/2020/06/53922290564.pdf
    • https://sudizixo.files.wordpress.com/2020/06/52763385366.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_off00005e9f.bin
812420cc815d5c9ca4ae243122026112e5422bd59a107bfe1accf38647bd5918		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9F 10696 bytes

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