Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6422026e64c032b…

MALICIOUS

PDF

91.8 KB Created: 2021-09-18 00:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3d393a87827a79695ea8f84e52fb670 SHA-1: 8a2e4f7fc36d07df8e689dc6f8104fd964de128a SHA-256: f6422026e64c032b1ddadbd96eb721d98bd33a06b974c73eea0775de4fb84b55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, further supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://dylogistics.com/userData/board/file/sorikem.pdf In PDF document text
    • http://allmedicus.com/userfiles/file/83585123506.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/vodovalakofal.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/pepexizut.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/94012766861.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/fekejokegipolisox.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/22653445390.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/71003645116.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/fepudakezawisasodabuz.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/daledosazenelivefozuxaf.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/saxedifip.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/begofadiseravarisifakole.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/92107317537.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/mujebud.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140636e6933d---51703245157.pdfIn PDF document text
    • https://andana.us/files/files/98959359118.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/98453804644.pdfIn PDF document text
    • https://bawauang.com/contents/files/95792306072.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202193121424444.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/20995946078.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6272ecce5f04e4f7dd8bab80176a0d76/49187001100.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/96219167154.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/nunat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=dua+for+parents+health+and+long+life+in+quranPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 11024 bytes
SHA-256: 2f24c31afeba810a751837722e7954b6a4e237bc57e604cf4d118ba38361d698
font_01_sfnt_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12937 21304 bytes
SHA-256: 710d034a29dc1edb682c9e4a313b3dc6e0ceb045ac3d3dcb31213c36915bbc53

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