Malicious PDF — malware analysis report

Static analysis result for SHA-256 803654e275853151…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 15:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 44536d057da7a36025b9f0a6d06f915a SHA-1: bbf5e2b265bafb265a3bff1accf88cee8be9e31e SHA-256: 803654e27585315135bc9db8ef357fd7fe4f68af0d789136357d90c3283d8b52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially malicious content or phishing sites. The presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pixomot.ru/uplcv?utm_term=william+shakespeare+life+pdf PDF link annotation
    • http://dongtienlamnghiep.com/upload/file/37493268960.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/kaxodim.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/56070009720.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/nizagivuxabitabixugu.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/pewodotit.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/lalijij.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///24422428055.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/39109477165.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/wegesanivobofodidati.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/81048008207.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/jobeg.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/54610035767.pdfIn PDF document text
    • http://elpijisystem.com/file/22478108629.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/89180042609.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a33f23954---47478732823.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/zabifoxonilibubisigapused.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/53984781956.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fikekagob.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e04dd3fd5---xujoresusufanapulizix.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/sawepobirixerad.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/guxevotedetedezajitek.pdfIn PDF document text
    • http://all-premium.com/user_file/files/rifopibukabi.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/1332936156.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/22428424955.pdfIn PDF document text
    • 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_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 10524 bytes
SHA-256: 16e746651cb3bd894f6c6b83cbceffea3b00696fe865ad46596afe4acb3a11b9
font_01_sfnt_off000104d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE4 17688 bytes
SHA-256: 7792b3dee650d91a4e10c35f13c504d26fda94414be7e2eb85f6f19fefa935e7

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