Malicious PDF — malware analysis report

Static analysis result for SHA-256 841a75884eff82dd…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 07:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 39ac346e8abebd42e3002b4c098b1961 SHA-1: 617f91bcda17244bab4d51fd5a85b59c143a0974 SHA-256: 841a75884eff82dd0f291a2337184fb8a68268d57b7667beb3ebd75899d72823
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://medvor.ru/uplcv?utm_term=android+auto+car+app PDF link annotation
    • https://transmar.biz/ckfinder/userfiles/files/45724313337.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/72382762867.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/diwipi.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/xemegovozuvetofisara.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/96024171835.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/luzixoremagorivi.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/rikalosebixebirotenonis.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/xanaburejovaliji.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/57716681834.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614292eee90c5---2085263128.pdfIn PDF document text
    • http://minerva-collection.net/files/files/10223076389.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/71471141613.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/vewal.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/vanuxojezexibikogimad.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144090e933c6---fajozabawula.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/mokavukijep.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210919045459.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/poxodelovopefomose.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/gupupomalim.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210903033324.pdfIn PDF document text
    • https://databaze-zdarma.cz/userfiles/files/62180285900.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219181719427859.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/9035815647.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_off0000e0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BA 17680 bytes
SHA-256: c74fbb31f7e9f14303e04645ad9aa56b2ea1206852323049674874ccf36c34e6
font_01_sfnt_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001268e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268E 10240 bytes
SHA-256: 1b94603b3ca4db48f2434f5c568d5f94b40b49ec468141cd3efe64321b717a20

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