Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfaaaa3333723e5…

MALICIOUS

PDF

92.5 KB Created: 2020-04-11 03:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 298c39b6cae0667bda258a840d6819b2 SHA-1: 9179e0514c82e5700a09627f0426b3ebc5b80ac5 SHA-256: 9bfaaaa3333723e5b29dc59484ebfdd87a18b5386fd43a2de9a7f13e5f303810
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to seemingly unrelated domains with numeric or random-looking paths, indicative of a link farm or SEO poisoning tactic. The primary external URI points to a specific HTML file on 'bernardobellostudio.com' which is likely a lure page. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://bernardobellostudio.com/uploads/1/3/0/6/130604049/130604049.html#force+of+law+derrida
    • http://primeamazon.net/uploads/1/3/0/2/130270752/7857896.pdf
    • http://loristegmann.com/uploads/1/3/0/5/130539130/25aa31ec8ac.pdf
    • http://peak-postpartum.com/uploads/1/3/1/1/131163782/vegumofa.pdf
    • http://naughtybitssoftware.com/uploads/1/3/0/6/130621206/ligizugotagi_kizovut_paxufid_vokixim.pdf
    • http://foxhatnomads.com/uploads/1/3/0/5/130588861/kifafeni_migovak_soxegidajuvufo.pdf
    • http://balmingileadskincare.com/uploads/1/3/1/4/131437102/8043767.pdf
    • http://reusegifts.com/uploads/1/3/1/4/131438642/6796403.pdf
    • http://clonmelwbc.com/uploads/1/3/1/4/131407353/temukiregezulawapuv.pdf
    • http://nekima.net/uploads/1/3/1/3/131378814/befazeli-parigesadam-batewilezora.pdf
    • http://somethingaboutmommy.com/uploads/1/3/0/8/130813403/4bdd0d.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_off000143a3.bin
8d0e90cd2e15c9835f6891b4699990454fd0f64ddfe5c5390dc303359175914e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143A3 9792 bytes

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