Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd1f650e4703257…

MALICIOUS

PDF

40.1 KB Created: 2020-04-05 06:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2f2a5d8d1f590ea5fb34d07bf21f9263 SHA-1: 21ea577fe68c290b7de5e86549a9482fa21931cf SHA-256: bdd1f650e4703257f3d12e249279e6dfbd4f99f536cd695a79b0c1503d23c016
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm heuristic further supports this. The document body text is largely unreadable, but the embedded URLs are clear indicators of malicious intent.

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://riversphilippines.com/uploads/1/3/1/3/131384232/131384232.html#politica+de+precios+marketing+mix
    • http://clintmorris4layton.us/uploads/1/3/0/6/130622077/1641147.pdf
    • http://oasissupplyco.ca/uploads/1/3/0/5/130590583/9707358.pdf
    • http://colmtobin.com/uploads/1/3/0/7/130738876/9105120.pdf
    • http://obituarydating.net/uploads/1/3/1/1/131163723/sigedufanenonap.pdf
    • http://getmindmate.com/uploads/1/3/0/6/130622049/8841613.pdf
    • http://webmail.bold-essentials.com/uploads/1/3/0/7/130776726/1307820.pdf
    • http://namjam.net/uploads/1/3/0/6/130620987/632391.pdf
    • http://smokenbones.net/uploads/1/3/0/8/130813998/5337399.pdf
    • http://splittencapital.com/uploads/1/3/0/2/130270826/8510532.pdf
    • http://lifeofamamma.com/uploads/1/3/1/4/131406709/dejifonogutodu-rabelap.pdf
    • http://pointhurstenterprises.com/uploads/1/3/0/7/130776874/gevede.pdf
    • http://offgridhome.solutions/uploads/1/3/0/4/130435877/vulazigijubaxix.pdf
    • http://zstones.com/uploads/1/3/0/5/130551187/966832.pdf
    • http://appareluno1.org/uploads/1/3/0/5/130541186/bb942ef0de946d0.pdf
    • http://vermilionyoga.com/uploads/1/3/0/5/130550938/xujul_kidikevoxe_nefasusifobaruv_godexunusidoto.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_off000072ef.bin
b05e29b6b8bb1110ddaf2a19a557e2125c8968d7eec9618f7ad0ec7f235858c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72EF 8512 bytes

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