Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a90a49a68c171a2…

MALICIOUS

PDF

50.8 KB Created: 2020-06-06 21:40:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0de6280dea7a67be860b8f8d4c28e5f SHA-1: e8a2a237b22b3e67bf09ae0684f1d77cabb6a280 SHA-256: 6a90a49a68c171a22e2e419dd2e48cf3a8096c2a668f735f931667c48831d69a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a critical heuristic identifying it as a link farm. The document body, though partially garbled, suggests an academic context ('Exercice arbre phylog netique seconde') which is likely a lure. The presence of many external links, including those pointing to other PDFs and HTML files, indicates an attempt to direct users to potentially malicious or spam-related content.

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://white-lighthealing.com/uploads/1/3/0/2/130271201/130271201.html#exercice+arbre+phylog%25C3%25A9n%25C3%25A9tique+seconde
    • http://thebecnelreport.com/uploads/1/3/0/5/130541733/nasoxebutopofosase.pdf
    • http://djbowman.com/uploads/1/3/0/5/130588506/8984994.pdf
    • http://hpq7l.bpmtc.com/uploads/1/3/1/4/131408099/49300.pdf
    • http://visionsednetwork.com/uploads/1/3/1/8/131857213/gusow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nodezebibun.files.wordpress.com/2020/06/ninunifoxidokeja.pdf
    • https://gazaxafe.files.wordpress.com/2020/06/zavokewaboterugebogogip.pdf
    • https://kutexales.files.wordpress.com/2020/06/manusepumomumo.pdf
    • https://jokovuzowo187160868.files.wordpress.com/2020/06/nikeperaresisud.pdf
    • https://rudukaleditu308957543.files.wordpress.com/2020/06/neleduzamenifonuw.pdf
    • https://sakadukil.files.wordpress.com/2020/06/nosaxidiriwewuvemipudofu.pdf
    • https://mazagutote.files.wordpress.com/2020/06/videkagesudapuzogafanovud.pdf
    • https://puroditaduj70542517.files.wordpress.com/2020/06/51014507640.pdf
    • https://pavofozib.files.wordpress.com/2020/06/25292168953.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_off000091f4.bin
b7eb2426a012eaab7fac97d4b610a8429bd6c8f3e69d30473b807879d7de0076		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91F4 14500 bytes

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