Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c95484caac68d2…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 15:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e58c60877ffb59d7b2e805c103bc95e SHA-1: 57f6803d21a8f74b48bbb563db54d39e6d48d4b2 SHA-256: 57c95484caac68d2a57ace5b22860a0d64fa8a47f4a86f9c40a842667223e6b5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing malware or conducting phishing attacks. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of common malicious PDF techniques.

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://catamma.ru/uplcv?utm_term=the+martian+full+movie+free+download
    • http://xedaptap.net/userfiles/file/rawikew.pdf
    • http://thuocnam.xyz/images/files/7537835307.pdf
    • http://tnslib.net/userfiles/files/bomijukiximutowaxaked.pdf
    • http://steinemann-ag.ru/nimajimepukopobilusix.pdf
    • http://aristosaigonhotel.com/uploads/files/28549908108.pdf
    • http://beta-rc.com/upload/files/15051205746.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/36776581281.pdf
    • http://i-p-p-c.com/ckfinder/userfiles/files/63107410374.pdf
    • https://matfreklam.com/calisma2/files/uploads/60205977553.pdf
    • https://nicklason.se/ckfinder/userfiles/files/58013126500.pdf
    • https://hopadive.cz/ckfinder/userfiles/files/70948512156.pdf
    • https://cpsguffanti.com/uploads/file/gasobegiwadofubuvofo.pdf
    • https://agri-mal.pl/userfiles/file/74899204958.pdf
    • https://sainaudit.mn/File/kafuruv.pdf
    • http://ilsogno-bomboniere.com/userfiles/files/50544231456.pdf
    • http://www.pattyn360.com/upload/forum/files/xenulunebuposared.pdf
    • http://ieeepes-thailand.org/app/webroot/files/files/jajojasikugib.pdf
    • http://iact2001.com/userData/board/file/tulukumil.pdf
    • http://engcaphone.com/_UploadFile/Images/file/51991364769.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cf52086a927d06556588c6664d77620/fosikadebufu.pdf
    • http://changwontour.kr/FileData/ckfinder/files/20210911_F1D0D1BD7AC6BEE4.pdf
    • https://needlugs.com/userfiles/files/16366899171.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613745e4a78fd---sesevibikotufalaziweb.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e265.bin
b57057f0c2e85f51c0399d5c8f644e546309de53b339f2d508c768bd28092e8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE265 18468 bytes
font_01_sfnt_off00011267.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 16792 bytes
font_02_sfnt_off00012a7e.bin
924a67165b0742886e39606a0fdfcb9b70bd0037b64e58794f623a894dd06e5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7E 10668 bytes

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