Malicious PDF — malware analysis report

Static analysis result for SHA-256 2241dfda0b2ca241…

MALICIOUS

PDF

36.0 KB Created: 2020-05-03 17:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: df656092a49d3b474805f678aee330eb SHA-1: c54cbc1eb8c9b55c4198031e830a5d65b6899203 SHA-256: 2241dfda0b2ca241dd70cfd6aa906338a36ec44b40061cd3b7f882ab680a33b9
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be generated for SEO purposes, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The document body, though heavily obfuscated, contains references to 'Civics and economics unit 2 test answers' and the authoring application 'wkhtmltopdf', suggesting a lure to a potentially malicious website. The ML classifier strongly flagged this PDF as malicious.

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://preecelightning.com/uploads/1/3/0/5/130538859/130538859.html#civics+and+economics+unit+2+test+answers
    • http://markercampbell.com/uploads/1/3/0/2/130270904/naxurovojujenin_gukes.pdf
    • http://chalalabeauty.com/uploads/1/3/0/2/130289503/15c15a012eab.pdf
    • http://dwellingplacecounseling.com/uploads/1/3/0/6/130605255/gipasanativuri-kukafol.pdf
    • http://thewriteroi.com/uploads/1/3/0/7/130739573/0e9bb63e.pdf
    • http://abc-c.org/uploads/1/3/1/8/131856653/davasinaxovufef.pdf
    • http://jordanruthschneidmiller.com/uploads/1/3/1/4/131437464/6f0ecacaa.pdf
    • http://jamessimone.com/uploads/1/3/0/5/130588345/2084649.pdf
    • http://jhegranite.com/uploads/1/3/1/4/131456267/vifijabazu-popivopipuwix-sarodij.pdf
    • http://tammymcgee.com/uploads/1/3/0/7/130775977/nojix_tifapu_fotevulunaj.pdf
    • http://qilas.org/uploads/1/3/0/5/130539981/derekifo_mowuzigora.pdf
    • http://sulawtt.at/uploads/1/3/0/2/130289319/8200747.pdf
    • http://key4sell.com/uploads/1/3/1/4/131409305/fazima.pdf
    • http://renu-painting.com/uploads/1/3/0/3/130323196/6973945.pdf
    • http://anewgenerationinfarming.com/uploads/1/3/1/3/131379598/a997357121749.pdf
    • http://massagemarketingtools.com/uploads/1/3/0/6/130604923/jilivexa.pdf
    • http://anewgenerationinfarming.com/uploads/1/3/1
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00006170.bin
1cf21b4d86e0c2324310a86b14f58e07b8ef8c6b57bfd2f233eaef94acca6c52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6170 10020 bytes

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