Malicious PDF — malware analysis report

Static analysis result for SHA-256 734dfaeab7a89715…

MALICIOUS

PDF

32.7 KB Created: 2020-06-11 19:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 618524247b3513affd0d84f23dbdf7da SHA-1: 2d617994686ae9ff08404efcfa452a0734011b9b SHA-256: 734dfaeab7a89715fc267d640ca64c1a0a27a0dccfb0a9104bde5f78615ec2b3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO poisoning attack. The document body text, though partially garbled, includes keywords like 'Oxford cardiothoracic surgery pdf' to make the malicious links appear relevant. The ML classifier strongly indicated maliciousness, and the presence of many external links points towards a phishing or redirection attempt.

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://slidingdoorgearconsultancy.com/uploads/1/3/0/6/130639306/130639306.html#oxford+cardiothoracic+surgery+pdf
    • http://autodiscover.squamishfoodpolicycouncil.com/uploads/1/3/1/8/131859993/zaxok.pdf
    • http://encorporation.org/uploads/1/3/0/5/130539518/8795597.pdf
    • http://topxboxx.com/uploads/1/3/0/5/130551112/xakisozuvuke.pdf
    • http://hostmaster.sojorgeous.com/uploads/1/3/0/8/130874535/bizeraful.pdf
    • http://piscinet.net/uploads/1/3/1/6/131606629/jelurole_bonej.pdf
    • http://galaxyties.com/uploads/1/3/1/0/131070284/1048131.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://gitebilav.files.wordpress.com/2020/06/kowukuvazuf.pdf
    • https://binojenon.files.wordpress.com/2020/06/24210562752.pdf
    • https://motajixug.files.wordpress.com/2020/06/nopinarefapekulog.pdf
    • https://masivamup.files.wordpress.com/2020/06/92407913332.pdf
    • https://delixifagape.files.wordpress.com/2020/06/36594962020.pdf
    • https://suvasebe.files.wordpress.com/2020/06/25784298635.pdf
    • https://topafajanew.files.wordpress.com/2020/06/91302124244.pdf
    • https://bosoroju.files.wordpress.com/2020/06/5449075630.pdf
    • https://guvadade.files.wordpress.com/2020/06/polegoxez.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000544d.bin
ea6537d365ee17eb55d9dcca569adb8fdcb2f5fd26b2a7893e3d1fad81584c80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x544D 10348 bytes

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