Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d8d25e7ee7b9cc…

MALICIOUS

PDF

38.7 KB Created: 2020-04-06 11:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e63a8496f69d4cf8f5c49b04eeeeaf22 SHA-1: 55e48b8261b44f574837c15e9a456f9c968af890 SHA-256: d4d8d25e7ee7b9cc115647db62d85f5a3cc7433fad2772219a89f476d36e0f6b
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, includes a URL that points to a 'bushmaster carbon 15 parts diagram', suggesting a lure to attract users interested in specific content. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of linked PDFs, likely for SEO poisoning or to serve as a distribution point for further malicious activities.

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://raadnootdorp.com/uploads/1/3/0/4/130476853/130476853.html#bushmaster+carbon+15+parts+diagram
    • http://cassandrastrasiotto.com/uploads/1/3/0/7/130776031/2060251.pdf
    • http://urbanmaster.net/uploads/1/3/1/0/131070071/8039af90.pdf
    • http://serpicodevhr.com/uploads/1/3/0/7/130739690/6547288.pdf
    • http://harvestmoonmarketllc.com/uploads/1/3/0/7/130775796/88da52d.pdf
    • http://txstateacctclub.com/uploads/1/3/1/4/131483465/449194468dfed.pdf
    • http://srivisakaa.website/uploads/1/3/1/3/131384071/wezuj-vixuvo.pdf
    • http://lalaland.eu/uploads/1/3/0/6/130604782/5039574.pdf
    • http://dutreytaizenqigong.com/uploads/1/3/1/4/131483955/6693334.pdf
    • http://emilydeweyphotography.com/uploads/1/3/0/2/130291635/nemukabopiwuv.pdf
    • http://karituku.com/uploads/1/3/0/4/130483879/7231058.pdf
    • http://thevillagemiami.com/uploads/1/3/0/4/130489265/vameruxa_kukisub.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_off00006db0.bin
79e8d184549e17edb5d2ea4a2a532b852ee2bf029c5cf9224d703104aa2540d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB0 8480 bytes

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