Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a42881cc01e29d8…

MALICIOUS

PDF

36.7 KB Created: 2020-04-26 00:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 36c86db0c953682b372c3522adf4bc26 SHA-1: 1cc8c1f43de0fdfc9ecff76286a2909edb47cb14 SHA-256: 1a42881cc01e29d8efe81ebdb2641c3a60eda48008c3a6d966c1c1976afd5a6b
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, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO manipulation tactic, often used to distribute malicious content or phish for information. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://thisisbourboncountry.net/uploads/1/3/1/3/131384115/131384115.html#asus+strix+software
    • http://calvertelectrical.com/uploads/1/3/1/3/131383533/bakumevole.pdf
    • http://heatherrobertsphotography.com/uploads/1/3/0/4/130489926/zeduzobilasoj.pdf
    • http://vidtoys.com/uploads/1/3/0/3/130313081/6e51f0895.pdf
    • http://quickbots.ca/uploads/1/3/1/4/131452893/zabotetoliwuruvuwe.pdf
    • http://francoischevillotte.com/uploads/1/3/0/5/130540814/jaroxoxezuju.pdf
    • http://pribba.com/uploads/1/3/1/4/131482954/rigaw.pdf
    • http://nvsolaradvocate.com/uploads/1/3/1/4/131406541/bopibefexa.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_off00006767.bin
625325c6f0b158cca5e07e0667b93be1a4da214d54c9f7cc870c6c37f3e84a50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6767 8344 bytes

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