Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd671eb2b9b425bd…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 12:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1207b50f6b2dd5d10527daeec9f9cbbd SHA-1: e5ea2599bd9e28102dc8daa7ceda4b644cceb856 SHA-256: cd671eb2b9b425bd760c13adcd9c9bafcf017e0c4ae7c9b8f0fc0e9f60fe93a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to disposable domains, with one prominent URL pointing to 'catamma.ru'. This suggests the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://catamma.ru/uplcv?utm_term=halal+love+story+full+movie+online+free PDF link annotation
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/90414822060.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/47988570538.pdfIn PDF document text
    • http://net-work.cz/data/file/giwarixewitadabavinukipak.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/58500466750.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/vebigupudolaz.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/pajapajevuluxulesegi.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/lukadejupazuluverumexukuf.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/farosituribigakidezowudig.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090704184173499.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/sotug.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/nolebudabajabeni.pdfIn PDF document text
    • https://cartolmania.it/file/73844533300.pdfIn PDF document text
    • http://selidbe-beograd.info/files/88529168722.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/pubirisetexojuzomomarunus.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/xomulimexezupujisupapimi.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/rilezalepoxetepuvoboroj.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1614190e81ba14---vudav.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/duganinaf.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/14101959911.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/sikiwitusubules.pdfIn PDF document text
    • http://armanetti.com/images/33422027823.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/82733867365.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_off0000d827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD827 17864 bytes
SHA-256: 97a825bde6981878e7b943b5696bdf2ced8d3481a02d00bb5485027878b0c8f5
font_01_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB5 10644 bytes
SHA-256: 604bf44844106be677dc462adccb2a411bbb78f52924def6f13c436a05af6d11

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