Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4900ed0f994a884…

MALICIOUS

PDF

50.8 KB Created: 2020-03-13 03:13:44 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0cee480da61a3b83d2e6d47f58898e69 SHA-1: 070b5487ac9e5fd0e2c37fbc7ca337d458eb67ed SHA-256: f4900ed0f994a8844990d615f9e0034cc47f756508adc4b23b8b4dde81f71257
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body is heavily obfuscated, but the primary attack pattern appears to be the distribution of numerous external URLs.

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://baylandesign.net/uploads/1/3/0/8/130873949/130873949.html#derrius+guice+career+stats
    • http://azaharaong.com/uploads/1/3/0/3/130379078/45d541304b28a.pdf
    • http://farmlawyer.com/uploads/1/3/0/6/130620820/7222729.pdf
    • http://www.bigredwrestlingclub.com/uploads/1/3/0/7/130775962/7804567.pdf
    • http://securities-lawyer.us/uploads/1/3/0/5/130588727/nupaxavanefo-jebibuvapola.pdf
    • http://williamledbetterfoundation.org/uploads/1/3/0/3/130379204/katoga.pdf
    • http://ventonconsulting.com/uploads/1/3/0/5/130544468/mupovevukom_kulegoxiva_jozidixis_jepexonumir.pdf
    • http://befois.com/uploads/1/3/0/6/130639533/7607439.pdf
    • http://ns.helpfulchanges.com/uploads/1/3/0/4/130476607/31e228f66.pdf
    • http://thesustainables.net/uploads/1/3/0/3/130379213/japizozikepoditota.pdf
    • http://konect2us.com/uploads/1/3/0/6/130604203/86e90c6.pdf
    • http://wijdstraat.nl/uploads/1/3/0/8/130873979/kaxur_bedenu_dimobusoliruk.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008705.bin
474919373742e27a97874b6366374385593576f4d6ae9c9dc158895c65355f45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8705 8652 bytes
font_01_sfnt_off0000a862.bin
23c65972817dfbf7cab1ae3aeb90eb31327f22f5d6c5df27573a93fcd47230d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA862 16228 bytes

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