Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a53f18ca8772b8…

MALICIOUS

PDF

79.3 KB Created: 2021-03-25 00:49:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71e318b86dd4431904bc67936274a8f3 SHA-1: 450cf61eb03495a68b6ce056e981a9e6685213ac SHA-256: f1a53f18ca8772b89ae8c7329ff0105449674b1071f20a1a7fbbcdd6f5a5e02e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a phishing campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wix?keyword=vgate+scan+vs890+user+manual
    • https://cdn.sqhk.co/defisepeniba/W7jj1zt/meteor_shower_california_august_2020.pdf
    • http://kafujaguvo.mygamesonline.org/31353297655.pdf
    • https://cdn.sqhk.co/lexijunibul/hgigGgc/easy_printable_crosswords_for_seniors.pdf
    • http://dotenipago.medianewsonline.com/integral_calculus_for_gate.pdf
    • https://cdn.sqhk.co/nakunadubux/idibYMc/xojuwu.pdf
    • http://tersq.fun/numoxadorofajumip14g5i.pdf
    • http://lefibipefazefep.mypressonline.com/can_blood_be_too_red.pdf
    • https://cdn.sqhk.co/faxinomitux/jhiehfJ/16044581917.pdf
    • http://pagebake.com/238265461790rdf0.pdf
    • http://biomaniks.website/wawetax7p27.pdf
    • https://cdn.sqhk.co/tumowara/Jkhcgho/35954498560.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_759e0b6b3f8e4d0187e8304377e2e883.pdf?index=true
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_a2b477fce5b94e83b1cdd39188cfb00d.pdf?index=true
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_09cb4b4928f0440fa54123e9b1de3b56.pdf?index=true
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_0c5a7ce9ca32470c993f6f58e2ad69ed.pdf?index=true
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_e47f2e6dc1b44aa1abb129da1b0484d6.pdf?index=true
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_29207dc5792b4919b75d46d3afdb2f5d.pdf?index=true
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_e794567d691847979d6e3d215e2ace73.pdf?index=true
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_65892af0cdef46a4b5302be6253e8016.pdf?index=true
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_02ffcd9805f24d259c744613b8cf568c.pdf?index=true
    • http://lumalidik.atwebpages.com/wizukawad.pdf
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_290e922b4a824c6ca8df0cb6a144d36b.pdf?index=true
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_aa09742a2b264849bb80f5e41cbbb9a7.pdf?index=true
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_41d0bae7318344d78fcc906c09ed7db5.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_off0000f86f.bin
358894cf31b6519eff6bc6dbe7add337f43f106faeac60061adf1fd4de55aca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF86F 5636 bytes
font_01_sfnt_off00010b8f.bin
3ceb737e0de1489af6e7a48115696de505c9e225dd31cd93d6c8627fe8626b19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 10492 bytes

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