Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c95903bcce1a642…

MALICIOUS

PDF

42.8 KB Created: 2020-11-06 18:05:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c06702316fd1dbe0600c5bdb9eddab89 SHA-1: bbd6ad29b05d4379ddfd247e29c82e267240a27c SHA-256: 3c95903bcce1a6424e2e5366dfdba90c5cb4b7a0fe58c375047d9a498c25b9ab
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, with one suspicious URL identified as a potential entry point for malicious activity. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic suggests this document is part of a link farm, likely for SEO manipulation or to distribute further payloads. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 https://trafficel.ru/123?keyword=winter+facts+scavenger+hunt+answer+key
    • https://cdn-cms.f-static.net/uploads/4416332/normal_5f9bca5a02b58.pdf
    • https://cdn-cms.f-static.net/uploads/4451028/normal_5fa175f70579f.pdf
    • https://cdn-cms.f-static.net/uploads/4420239/normal_5f9eaeb97ee61.pdf
    • https://cdn-cms.f-static.net/uploads/4389104/normal_5f99ddd1b221e.pdf
    • https://cdn-cms.f-static.net/uploads/4409394/normal_5f9e7a49d542d.pdf
    • https://cdn-cms.f-static.net/uploads/4369915/normal_5f99019c4e904.pdf
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/wokemawudire_kikogivip_lufujolaw.pdf
    • https://cdn-cms.f-static.net/uploads/4405437/normal_5fa2193b4c8d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dc14e15b-f0f6-4ee2-9a4b-e7ed547051e5/the_freud_reader.pdf
    • https://s3.amazonaws.com/nigimul/pefenulijuririji.pdf
    • https://uploads.strikinglycdn.com/files/b9566308-7967-458c-a0e3-7c8658f93a7b/7563970681.pdf
    • https://s3.amazonaws.com/metubevozisul/onkyo_m_5000_review.pdf
    • https://s3.amazonaws.com/zuxadol/hvlp_spray_gun_kit_harbor_freight.pdf
    • https://s3.amazonaws.com/piradi/rebunojimukogupojagako.pdf
    • https://uploads.strikinglycdn.com/files/45d57bb0-a671-4220-bf5e-6b1be4bba20c/78914423949.pdf
    • https://uploads.strikinglycdn.com/files/06d2d572-0302-469b-96cd-2a800fc8c472/dibazizufu.pdf
    • https://s3.amazonaws.com/temujonuwu/51919747589.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066eb.bin
207bcb6ce2f5f02685d21e13b8b6fd3a37b45df46315969f01ba4afe2c119f70
pdf-font-stream PDF embedded font (sfnt) at offset 0x66EB 5440 bytes
font_01_sfnt_off00007992.bin
9ad3a22e1fd8862af415df61efbf419824589cdc5e19eae0aa94e297a7b4b8a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7992 10792 bytes