Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a21f876fcee6ac5…

MALICIOUS

PDF

77.5 KB Created: 2021-03-27 21:17:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acf6a955b97ae560a669f74a723efe59 SHA-1: 8e925d78a026f1117ca99d85e7e31db96b3b79d8 SHA-256: 6a21f876fcee6ac5c94a79871edc3b9706a54c10bf869f8539b5c235ef44bca5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier also flag this PDF as malicious, likely due to its phishing or trojan-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://midufefew.ru/award?keyword=sandvik+tools+catalogue+pdf
    • https://zujedezagepom.weebly.com/uploads/1/3/0/8/130874220/7620623.pdf
    • https://bematurom.weebly.com/uploads/1/3/4/8/134886193/subowazomet.pdf
    • http://zukapojijedolof.22web.org/ayat_alquran_tentang_riba_dan_jual_beli.pdf
    • http://tiximixisasosa.iblogger.org/poxizipikapa.pdf
    • http://wosutopanoba.mygamesonline.org/boolean_search_terms.pdf
    • https://bixugukov.weebly.com/uploads/1/3/2/6/132680808/keziko.pdf
    • https://xelegiri.weebly.com/uploads/1/3/4/4/134435730/manik.pdf
    • https://tajamopem.weebly.com/uploads/1/3/4/7/134745730/0a416d5.pdf
    • http://sutiboju.sportsontheweb.net/zoxelosan.pdf
    • http://movawizaxaxato.mywebcommunity.org/elias_canetti_auto_da_fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://subejev.rf.gd/pak_navy_jobs_2020_online_registration_slip.pdf
    • https://9dc8676a-0e58-44ee-a512-e339c7094702.filesusr.com/ugd/7c0652_2921995e4cda4ceda1ddc629940f3e8c.pdf?index=true
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_13638e6ca64d45ffa0ec6710f1c4f8dd.pdf?index=true
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_109d8c7bb1ef4f39aa373248922e284b.pdf?index=true
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_9964f041e091427b8a53542a2bc28fde.pdf?index=true
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_4f7101a445e4451d88a9f52ec179d9cb.pdf?index=true
    • https://1350f94c-8d6f-42b4-8351-24983ad6a49a.filesusr.com/ugd/4aae87_e844c7b60588436d99424501fb548306.pdf?index=true
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_5589516866ae4e6e9d2011ea9e9c3147.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_off0000ed7c.bin
407be4b26d86ff5deaf3f52cd45dddb5d79e39954fb0da9eca53eefc8b098d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 5456 bytes
font_01_sfnt_off00010030.bin
db9fb81f0e81b6da5674579e7a7efc1644a60acd656970a0e0aaedafdb2742b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 12600 bytes

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