Malicious PDF — malware analysis report

Static analysis result for SHA-256 de781b4f0ae3e7ab…

MALICIOUS

PDF

73.1 KB Created: 2021-09-29 02:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 34631daa3c6c8bd08e8c8beb271102d2 SHA-1: 4b46f2cd1d1616a47758d8e3b0cec9e3b974d37a SHA-256: de781b4f0ae3e7ab4afd6b08dc2121f5256ee7f4043b26febd45ad98c67f1935
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to suspicious domains, many of which are identified as part of a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=kolkata+bangla+movie+2016 PDF link annotation
    • http://esllearningbydesign.com/app/webroot/files/file/33152136367.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161426577ea15c---bawofizikebusesoz.pdfIn PDF document text
    • http://turnyras.lt/Files/file/vurudesapemonusupuzisude.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-23/20210923171152235108.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/nunafadozebeduler.pdfIn PDF document text
    • http://travellerisland.com/files/55053045464.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/92528578277.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/27939865163.pdfIn PDF document text
    • http://koala-al.com/d/files/nunepidaxapusesefilinop.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/rutividuwamuxadikuxiru.pdfIn PDF document text
    • https://rajaunited.com/contents/files/72574927063.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/841sm27c9p7miu4s4uf4llt521/83773542711.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161514ffbdeaeb---70356052534.pdfIn PDF document text
    • https://apra.pl/files/file/43894884685.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/pipinelunudilavanujax.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/vipatijajowodepigireki.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/mobalufi.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/tisugativimakorugafe.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/62487768285.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/jikojuponemaga.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/bejuganulebojin.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/lutavabenavijolaxobupot.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/kivenebolegolizonatuma.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_off0000b467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB467 10932 bytes
SHA-256: 99675d46204790c5037d97ba2b17ff13ef94389010816c032b58a8934cdc8c82
font_01_sfnt_off0000cdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 19168 bytes
SHA-256: ab4af8ed0c11d72bba82bf99a8a7d4a038bb0d6c6eef37ddd609a8f491a4fdd6

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