Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d26ff4f559f44c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 06:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eba45bcf5538e864c9fc65472c9f74f6 SHA-1: 224083060fe964aedaf7ecfabc4c77eba41c39d5 SHA-256: e4d26ff4f559f44c3991ef52c409dc05e7527611e128720b627172afe24cef4f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ML classifiers and ClamAV as a malicious PDF, specifically flagged as phishing and a trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final destination, likely a phishing site or malware download server.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medvor.ru/uplcv?utm_term=bad+ice+cream+4+player PDF link annotation
    • https://ourcampuswindow.com/ckfinder/userfiles/files/3920401383.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614041d68602f---74384963851.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/1487172819.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/suvetesapamubofulubosej.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/41251487502.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/84278048823.pdfIn PDF document text
    • http://delve-cr.com/uploads/45977750254.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/nenoluvidutan.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/18698935748.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/buzeboloduvumap.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/xerexow.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/51662471588.pdfIn PDF document text
    • https://unaizahic.com/Files/files/84153104468.pdfIn PDF document text
    • https://edgecs.com/documents/7531693521.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/67058292334.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/69008843389.pdfIn PDF document text
    • https://brs.jo/userfiles/files/xazaruje.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/zorirewedejoxufobuguzowi.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/lufusalerelima.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/jebejenopozunagubami.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/24358743622.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/vorisade.pdfPDF link annotation
    • https://ud-hobby.com/images/Upload/file/74550183424.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_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 17888 bytes
SHA-256: 4d6450ba83e87c7dd266c75ae18b96189a241e815d57ed6363e15c7620bf71b7
font_02_sfnt_off00013205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13205 10432 bytes
SHA-256: dec3c4dd0c1564d693e87d281d6c28b12653c8a9b5d800b435d12db0448e3ffe