Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cddee4c5761df9…

MALICIOUS

PDF

40.8 KB Created: 2020-05-08 03:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ed3810bc08e8de67ab8a30b419afcc8c SHA-1: f86e31e25a7225712984ba2b197455addca2022f SHA-256: b2cddee4c5761df9b8db8f1bc426ecef82de5759fb4cc17495dd22efa0a9a6fa
96 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to other PDF documents hosted on various domains. The ML classifier strongly flagged this sample as malicious. The primary attack pattern involves directing users to a network of SEO-optimized PDF lures, likely to host further malicious content or phishing pages.

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://ucalgaryenactus.com/uploads/1/3/0/9/130969762/130969762.html#boiler+notes+pdf+nptel
    • http://michel-peres.org/uploads/1/3/0/2/130270897/4575303.pdf
    • http://100kidswhocarefoxvalley.org/uploads/1/3/1/4/131406708/gumekizi.pdf
    • http://cshomesecurity.com/uploads/1/3/1/4/131437139/d9f6c.pdf
    • http://mcmenamingolf.com/uploads/1/3/0/2/130288802/jiraterebefir_vinemituwifogu.pdf
    • http://sweetcarolineliving.com/uploads/1/3/0/2/130272362/benewul_xotulep_xalokoved.pdf
    • http://beefancyapparel.com/uploads/1/3/1/4/131406714/1882376.pdf
    • http://phceventsjersey.com/uploads/1/3/1/4/131406403/bonolawanili-nodupigaxisiriz-ponotadotisule.pdf
    • http://fragrancemix.net/uploads/1/3/1/3/131398425/4854167.pdf
    • http://pradnyam.com/uploads/1/3/0/5/130545493/9178610.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fec.bin
2253582c3f64b7f5feb84d667aabfd2970e75534a73236fef259a55d491e7722		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEC 10700 bytes
font_01_sfnt_off00008494.bin
116e1aefc1bdc9fdbdc8bc4ca32ed8fc2a9096b6ae60b76e258fcc2d5524df3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8494 16112 bytes

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