Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a3f6356410b977…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 13:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c474325924ab8fb13d1858bc49505b3b SHA-1: e2b608b19bee13ef184ca6e398492d05801e28e5 SHA-256: c2a3f6356410b9775dc26d139b07cd783f8bc7b63232541f8c8f3b9a0d690c56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=best+game+100mb PDF link annotation
    • https://nabijdefossa.nl/upload/files/videdogi.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210918234610.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109152256558165.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/3386705919.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/81552471358.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/19135112663.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614085f1357b0---52273798754.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/pekovuponimezerebagigozut.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136bafa48208---zakoreta.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/nobifuribeguwipokaliguf.pdfIn PDF document text
    • https://arendic.cl/files/fudigewoferinu.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/kivobajoximezezutezoruv.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/gubizefavepan.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/97053265175.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/kebogusazutub.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/90888154601.pdfIn PDF document text
    • https://digireg.si/upload/66522750798.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/5720393328.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/18434308169.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/93176638877.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/52501155814.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_off0000d4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D7 17440 bytes
SHA-256: e149374d408db2bb539cb416ed7403548b8813ebd039b59181b06f754fd54f1c
font_01_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A14 10356 bytes
SHA-256: 0d8d53654f430e3c678f6b0b6303bb98269031bef2e727befd2cb2e001180835

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