Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b8cb58b21e67c5…

MALICIOUS

PDF

81.7 KB Created: 2021-09-22 17:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b763be111b032b040183e8a6c3b6dd71 SHA-1: 1169ad7d7abb58829b9fb2cb6bce23726b891197 SHA-256: 92b8cb58b21e67c56964bd6dbe878e77c236c081280be019ef29a920a4d25ef8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are structured as link farms or disposable hosting, indicating a likely phishing or malware distribution scheme. The PDF structure and embedded content suggest it's designed to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=best+paid+games+on+mobile PDF link annotation
    • http://smolensk-bakaleya.ru/userfiles/file/86980373641.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/dejoguwenef.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/fufelewomodov.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdad313297---lotet.pdfIn PDF document text
    • http://darstin.com/userfiles/files/21836773898.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/75694441512.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/tenozabezopuzejasozuzakar.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/ritadebefasofez.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/migajalokinefirupiz.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/xiwukakozu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161313d1098a5a---69977499096.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109211254421350.pdfIn PDF document text
    • http://profstil.az/userfiles/file/linarawepufofa.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/5541630115.pdfIn PDF document text
    • http://afslab.asia/upload/files/gizowutumotakoboge.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5645tll28p7bcg5lq5l4d3hs54/37195756804.pdfIn PDF document text
    • http://unsersohn.ch/images/file/zafafoxowofisuzunodix.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/43829885192.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/65367191654.pdfIn PDF document text
    • http://ty-int.com/files/files/57051506874.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/zaxiwixigezinasajese.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/11351208671.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/86520618524.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/66199157272.pdfIn 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_off0000e1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0A 17596 bytes
SHA-256: de83ac85eb431c38702873d3d94012c74a1c8b410090f3c3d77f1a20ee4dd311
font_02_sfnt_off000127bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BD 10828 bytes
SHA-256: 8839bf5fa45e465011f2a54deec3dc098fb3a2e4cb2bdf3556bc9b624fe7964f

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