Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eea70576d204906…

MALICIOUS

PDF

33.1 KB Created: 2020-04-21 05:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1db245f536a5f202b165571e5c12db81 SHA-1: 00852a436d0374812fa60687e3b1bcd3c8f11866 SHA-256: 9eea70576d2049068e745ca886fbd591b71a0d75cb6d40dec8cc9f8ce35603e4
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a significant number of external links pointing to various domains, indicating a link farm or distribution network. The ML classifier strongly flagged this PDF as malicious. The presence of numerous PDF links suggests an attempt to manipulate search engine results or distribute additional malicious files. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://thetreesproject.org/uploads/1/3/0/7/130738848/130738848.html#android++apps+without+wifi
    • http://828media.co/uploads/1/3/1/3/131398380/c4a0a8.pdf
    • http://politics-international.com/uploads/1/3/1/6/131637374/4e88c0d324ff168.pdf
    • http://serenityasheville.com/uploads/1/3/1/3/131383679/zugen-nobedabidu-pitud-jisewam.pdf
    • http://solit.club/uploads/1/3/0/6/130640136/kexinomiwok.pdf
    • http://pobopdx.org/uploads/1/3/0/8/130813458/duniwedo-xanim-munejeni-kamagizigujo.pdf
    • http://ketoandsweet.com/uploads/1/3/0/2/130274376/ee4682705.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_off00005b3e.bin
a20f1f7dda70deba54798c2c994a5ac58da54d61717090fb463520cfccb8de6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B3E 7720 bytes

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