Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfaf37b574f80bb1…

MALICIOUS

PDF

71.7 KB Created: 2021-09-27 11:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55784ad0199d391315e468eae230cfb2 SHA-1: 3605d4e0ace73797614dd04d0bbe651bfeca48ef SHA-256: cfaf37b574f80bb113487a6d1c4d1044de5d53fdfe0fdf7dd0b10f294932df0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to direct users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=download+nfs+carbon+windows+7+32+bit PDF link annotation
    • https://motodubai.com/uploaded_images/files/45284043539.pdfIn PDF document text
    • http://www.toptehnik.si/images/7506926865.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/85002448330.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/32236736820.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/47949348450.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/275574539.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/89479278940.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/xoneximewifedeguvujevop.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/69763382990.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/nazasurusit.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/mubimogudoni.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/23504233428.pdfIn PDF document text
    • https://novsport.com/content/File/kokukilisokanusaniboto.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/83332622565.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/tuwerupedonekubijokojuj.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9bf96a7750cac5a620d040de189cfb4e/35219687174.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/kuwaxetu.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/98515407490.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/mekokivuzepigovewow.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/65420114844.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/7247610008.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/19490138136.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613886e71c34d---komebawutugesexogurafi.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_off0000b242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB242 10904 bytes
SHA-256: 7a08364e200d2bcce0fb04c6f137ba42fcc2107a2b4014df124119a1325794a4
font_01_sfnt_off0000cbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 16780 bytes
SHA-256: 9685829f25dec43ce90b0e19f62c132cc068de19c5ae03bb0b2ddedddf68e3b6