Malicious PDF — malware analysis report

Static analysis result for SHA-256 a497456e4ae3b740…

MALICIOUS

PDF

75.7 KB Created: 2021-09-24 07:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fbd1911872bff417ad0363cf3f65f6fc SHA-1: 1f1f8c4c52bf33f910e3da06ed0088fad15cd5b5 SHA-256: a497456e4ae3b740789c2fde50227efdf4f4c87142b6621ee003f515b0fdeeb7
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to obscure the true destination. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://coretry.ru/uplcv?utm_term=android+email+address+validation PDF link annotation
    • http://apsara.ru/userfiles/file/58277873002.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/99521623292.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/71602349408.pdfIn PDF document text
    • http://obedovice.cz/userfiles/file/32145104799.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c50574e88a0de8a7f435b3fd64b0f325/66038910786.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/92162222516.pdfIn PDF document text
    • http://le383.com/uploads/files/68076996377.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/37951577066.pdfIn PDF document text
    • http://teplospectr.ru/images/files/34325805746.pdfIn PDF document text
    • http://kelsenator.com/userimages/rogerovuratef.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210904_EFA9C2BEC87B3DC8.pdfIn PDF document text
    • http://onlinevay.com/upload/files/suteru.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/88424085983.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/tudojavikogikimele.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/131821104340.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ed7d7f55d---82663441905.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_off0000b733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB733 22920 bytes
SHA-256: 9ee1bba5b777a7872beecdcb155d0b76e170c1919e4045fdd072435a2c77df00
font_01_sfnt_off0000f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 10456 bytes
SHA-256: 565f20a21bdc48ee72c46f4c7640b20d59bd557427812a4a2dc066d2eddff171
font_02_sfnt_off00010a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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