Malicious PDF — malware analysis report

Static analysis result for SHA-256 182150d2cfa91e88…

MALICIOUS

PDF

82.2 KB Created: 2021-10-09 19:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 18b04547ec2ba48eabc1a5ff1b57dcdd SHA-1: fdb1b5a58f7068eb0c7e6160175baa4a1ff3c24a SHA-256: 182150d2cfa91e887f7afd40f30ea1af50746d1141bddb975fa0d64ddf94af2c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with a high-severity heuristic indicating it's a password-protected archive lure. This suggests the document's primary purpose is to trick users into believing they need a password to open an archive or attachment, likely to bypass security scanning. The embedded URLs, while many are marked as unknown, contribute to the overall phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ivantomanov.com/userfiles/file/lalujuzudedesu.pdf In PDF document text
    • http://boatmonies.com/uploads/files/42164976230.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/80046706044.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/34354250610.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/98758684938.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/dekopeloxuvegavedadi.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/298674664.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/navilozitokitabixuwusuxek.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/71654817903.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/48413883638.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/sakad.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0c59509a8---posejetodituxapuzovupo.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/fozazuv.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/wigezezulebiku.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/tejeb.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/likogupofuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cheese+and+garlic+sconesPDF link annotation
    • 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_off0000d993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 19140 bytes
SHA-256: d42777f4bbf0cdc535fd246ac49b3ccf6f0422df6f25edb192154b6010ac59d6
font_02_sfnt_off000123f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F1 10580 bytes
SHA-256: 2c11ceb90564ff8e5fa99fe1f7d9d9d2bb0f1aab426190c115bfadca4a9d89be

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