Malicious PDF — malware analysis report

Static analysis result for SHA-256 4744dec80a4e01e3…

MALICIOUS

PDF

29.2 KB Created: 2020-11-06 03:29:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7e277618e6279562b32668c1db03392 SHA-1: 53b873f826d2e5cc21c0e2aa28a6ac8acd8a99f6 SHA-256: 4744dec80a4e01e3805d2be6f1e1c181c2437a333f1284771d9829463284cdab
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by an ML classifier and contains a large number of embedded external links, suggesting a link farm or SEO poisoning attempt. One of the primary links points to a URL that is not yet classified, indicating a potential distribution point for further malicious activity. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links are indicative of a phishing or malware distribution lure.

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://trafffi.ru/123?keyword=qy8+headphones+manual
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/6305167.pdf
    • https://pozimetotekiv.weebly.com/uploads/1/3/4/3/134339641/980699.pdf
    • https://cdn-cms.f-static.net/uploads/4380680/normal_5f9aedc6ba2d5.pdf
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/2201721.pdf
    • https://dujodorenenap.weebly.com/uploads/1/3/4/4/134488447/fuzupejabuki.pdf
    • https://sevanilab.weebly.com/uploads/1/3/1/4/131437268/2851860.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wovitiku/set_2_geologic_history_of_new_york_state_answers.pdf
    • https://uploads.strikinglycdn.com/files/5d284f07-1997-4c01-b4a7-628cc68a719a/measure_and_construction_of_the_japa.pdf
    • https://uploads.strikinglycdn.com/files/36fa45fb-fe6b-47f6-b6b2-2d8730d958f0/damimifipomukom.pdf
    • https://uploads.strikinglycdn.com/files/a47b886f-b417-401d-b82e-5f7f068007bf/2589497882.pdf
    • https://s3.amazonaws.com/jadere/wosafijexodazefilo.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_off00003893.bin
473d99436067e34d3f62acf38b15995e20660ba98104e28e4b5b3e19b7064e27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3893 5460 bytes
font_01_sfnt_off00004b05.bin
a6d221f886b86bb9e2d7c81083bc0f4a206dd6437254689998f91a2cf475c8a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B05 8804 bytes

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