Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0e05a2c3e288df…

MALICIOUS

PDF

71.7 KB Created: 2021-03-12 10:05:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c75bff8487fe26e65b8223cbc74965ae SHA-1: 19249a18a161a538690b939946baa3595d477417 SHA-256: cf0e05a2c3e288df9882100f265ad329b4eb02ec727d52d0fdccae34cca4d549
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, suggesting a link farm or redirection mechanism to host malicious content. The primary suspicious URL identified is https://jacksth.ru/award?keyword=personal+pronouns+exercises+intermediate+pdf, which is likely part of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/award?keyword=personal+pronouns+exercises+intermediate+pdf
    • https://cdn.sqhk.co/teforoke/hcYXjaG/81421939026.pdf
    • https://cdn.sqhk.co/kegufamop/jekBZie/juzomakuvopikibi.pdf
    • http://espaceabonne.com/15021651028rboay.pdf
    • http://nikaold.site/410277549862bnww.pdf
    • https://cdn.sqhk.co/kutajanode/PzyiimK/kevevivapizoneb.pdf
    • http://nazhivy.net/375486566072b2sc.pdf
    • https://cdn.sqhk.co/jumifokujuje/5ylMKhh/dezorojojazedinosisor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_939338bf4dd6402893ecbf0fc4cfde69.pdf?index=true
    • https://s3.amazonaws.com/vavapekadoliti/kixaxalisuwujiwa.pdf
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_b3ac801dd90c4157a4341799fd4c7802.pdf?index=true
    • https://s3.amazonaws.com/zifozujiwi/54537815016.pdf
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_3c664b7835ec408680f071c949c606f7.pdf?index=true
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_f6a8d403f01948f8837aa29cbeb73369.pdf?index=true
    • https://s3.amazonaws.com/mujesogi/50907481558.pdf
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_bbc29036333449d1876cb3a18ebbcdf8.pdf?index=true
    • https://s3.amazonaws.com/somamere/how_to_clean_the_facial_steamer.pdf
    • https://s3.amazonaws.com/zupenafud/18183804057.pdf
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_412bd0164a3c4e9da432102c8a12a720.pdf?index=true
    • https://s3.amazonaws.com/sixenogafopoj/mexatij.pdf
    • https://s3.amazonaws.com/miledu/44512078095.pdf
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_a034fa577e6849989f28051589f79b70.pdf?index=true
    • https://s3.amazonaws.com/dogevazapiwediw/hitchhiker_guide_famous_quotes.pdf
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_c4b50066c772462897896100658a854f.pdf?index=true
    • 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_off0000db47.bin
ea1c28a005a6951e557a90d8ce90c9e4049004b463b32fb029ad051d58242020		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB47 5372 bytes
font_01_sfnt_off0000ed7c.bin
3a5f4e0d0bbb69cbcb1f51819565c67894c33f292821b4e7f4f2c5729184da83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 10412 bytes

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