Malicious PDF — malware analysis report

Static analysis result for SHA-256 5883d6e13b07a51a…

MALICIOUS

PDF

33.0 KB Created: 2020-05-14 13:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2379c8aafac13a12159cc37a48165c42 SHA-1: 1658a32f353c0c52c1f142b9b4745593bed22db6 SHA-256: 5883d6e13b07a51a36453bb28fd4a8f133f57a61da9ce07f8f86c97e51db93f4
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains. These links are likely part of a link farm designed to obscure malicious activity or to redirect users to phishing or malware distribution sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://stampers.ca/uploads/1/3/1/6/131637308/131637308.html#lagu+boy+story+handz+up+matikiri
    • http://simplechangescoaching.com/uploads/1/3/1/3/131382907/kozazapubelamokovugi.pdf
    • http://mech-llc.com/uploads/1/3/1/3/131398597/2531979.pdf
    • http://nicheconsultingservices.com/uploads/1/3/0/5/130539944/8d00f5af096b9d.pdf
    • http://misspitlane.com/uploads/1/3/0/6/130639669/04f6780ae693c9.pdf
    • http://wildbreedfarms.com/uploads/1/3/0/5/130539059/xizaboz_vuladosekuseme_zejekufewozexew.pdf
    • http://route66tulsa.org/uploads/1/3/1/6/131606923/7316707.pdf
    • http://ralphsridiculouspaintings.com/uploads/1/3/1/6/131606177/9369810.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_off00005330.bin
54e317ccdc8a7f0e7370a7ec8ad385693e9dbff6315707ea1102e5f959f21839		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5330 13008 bytes

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