Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5290cb091e66e2…

MALICIOUS

PDF

29.3 KB Created: 2020-04-20 11:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0987dae5da9719c401b026cfc3cbb455 SHA-1: 435e0ca87335e354a34c4d794b891b47e1eda313 SHA-256: bd5290cb091e66e2a170b455c19a7e666484f04a21b510d5ea19741c7c4b4d66
94 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or distribution network. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of external links is highly suspicious and indicative of a malicious distribution or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://clare-baskerville.com/uploads/1/3/0/2/130271085/130271085.html#baldur%27+s+gate+android+custom+portrait
    • http://danliliang.com/uploads/1/3/0/5/130588505/7493424.pdf
    • http://dinoarcode.com/uploads/1/3/1/3/131383958/tofuzuse_rapes_nivumote.pdf
    • http://photosbyrachael.com/uploads/1/3/0/6/130603725/nonod.pdf
    • http://teapartycoop.com/uploads/1/3/1/3/131398356/xokogozexa.pdf
    • http://theartofwidowing.net/uploads/1/3/1/0/131070597/dovebugabap_lalikedelugoke_sivik_fenuzinizore.pdf
    • http://edenvisage.com/uploads/1/3/0/6/130620677/a1508cb6baa.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_off00004b33.bin
d63be13c487425b50e841192def93b6bcf49253d95d185cdf7334c88b6c43fc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B33 8072 bytes

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