Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a4f5965eb48da8…

MALICIOUS

PDF

55.8 KB Created: 2020-04-15 15:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3a79cc4189f0686bb7faf377653053b0 SHA-1: 2f0d5ac1fd2c68e660316eba4cba854c2bf6443b SHA-256: 62a4f5965eb48da85991ca5020f9713f0d29e4bbc9840656fcef7fd6a253e7b7
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The document body, though partially corrupted, contains text that appears to be a lure, referencing an 'informal letter spm about health'. The presence of multiple external URIs and the ML classifier's high confidence score indicate malicious intent, likely to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://noellecavenaughyoga.com/uploads/1/3/1/6/131606493/131606493.html#informal+letter+spm+about+health
    • http://howtobeatobamcare.com/uploads/1/3/0/6/130604778/larulon_bubexarew.pdf
    • http://josephrossiter.com/uploads/1/3/0/8/130813855/5643086.pdf
    • http://educatingwithecellence.com/uploads/1/3/0/6/130620965/tikukufamudixupasit.pdf
    • http://leylaholt.com/uploads/1/3/0/7/130740142/5341808.pdf
    • http://werbemessershop.de/uploads/1/3/1/4/131438562/9029241.pdf
    • http://heart-itsanartthing.com/uploads/1/3/0/6/130620616/6792788.pdf
    • http://bikinibodyforlife.com/uploads/1/3/1/3/131398220/6860356.pdf
    • http://surprisejewelrycandles.com/uploads/1/3/0/5/130550738/3929124.pdf
    • http://cbconstructioninc.com/uploads/1/3/1/4/131453197/4473185.pdf
    • http://worthmanagement.net/uploads/1/3/1/4/131483454/5c63ad7948062.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_off0000b4bf.bin
b10d03e4b6acc330b29463af23a71ebf1c024dc844366d0335631b77a5c3d593		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BF 8020 bytes

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