Malicious PDF — malware analysis report

Static analysis result for SHA-256 113fc8f8b7efc84a…

MALICIOUS

PDF

48.8 KB Created: 2020-04-18 15:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 889e2b1956f6cbf16539d89325079847 SHA-1: 82c6b4c63788374f900a20324c34fefea4ee1046 SHA-256: 113fc8f8b7efc84ad08ec05d88096c607ed8b430f458e23e112f5c815039b69c
136 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'sales tax affidavit form'. The presence of a password archive lure heuristic indicates the sample may be designed to trick users into downloading a password-protected file, likely containing a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://damaru.net/uploads/1/3/0/6/130620173/130620173.html#sales+tax+affidavit+form+texas
    • http://petitgreengiants.com/uploads/1/3/0/6/130620962/9414a5f9401.pdf
    • http://goodstickgoodstick.com/uploads/1/3/1/0/131070112/fewutog.pdf
    • http://zonemaster.kunstinuwkleur.nl/uploads/1/3/0/4/130492229/mijimalumezevise.pdf
    • http://drmsanchez.com/uploads/1/3/1/3/131379769/a4b33e47b.pdf
    • http://servpro-philippines.com/uploads/1/3/1/4/131407708/3710992.pdf
    • http://iamgamebreaker.com/uploads/1/3/0/6/130604397/gexazu-pikajodeti-darex-zejezu.pdf
    • http://calgarymuslimwomen.com/uploads/1/3/0/6/130604085/gokusexejuzezajuzima.pdf
    • http://andreallardkirkland.com/uploads/1/3/0/5/130539019/2b58024a748.pdf
    • http://otherjamesbrown.com/uploads/1/3/0/6/130639873/3969367.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_off000095cf.bin
f8182d1c0ea36ae28ff23e5e0ac17bd200a88cd3f58cac6b0d84dbb6c86b5efb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95CF 8812 bytes

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