Malicious PDF — malware analysis report

Static analysis result for SHA-256 41764298134b51db…

MALICIOUS

PDF

83.8 KB Created: 2021-09-10 21:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 1998458e0488dd2e7a516b1cbe911b07 SHA-1: c52f95ecccaf4c9ca97597d017a0b8097dc97f7e SHA-256: 41764298134b51dbad0be33efb2b1a0c391bc28b48ce3b4fb400a6145f5814f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613741086ff4c---36503008475.pdf In PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/bagirevupuwiv.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/monemixavo.pdfIn PDF document text
    • http://rentaruedas.com/files/others/40668431678.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/85458604426.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/42518022652.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210902_68A7689CF3EC92DB.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/nemixuguritudoge.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/46271081488.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/lotobigig.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/dotajo.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/lusurojoti.pdfIn PDF document text
    • http://reylab.com/userfiles/file/46646138231.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/vusob.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210901_09BDBF9C1FA2E14E.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/49255225657.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210901091815_2064473199.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/8913875398.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/tupef.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/43038992039.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399ae88ee66---bebikefawifimozotanu.pdfIn PDF document text
    • https://ccskin.com/geektic/files/xinebulubosuzamimel.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/97204194854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=backup+and+restore+windows+10PDF 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_off0000e02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 10964 bytes
SHA-256: 5963a602749b0cc6c4d5850145531fb7c1ae2454771171eda3a3442fef03add9
font_02_sfnt_off000111fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FD 18108 bytes
SHA-256: ae209642424fa3928f0b51a3ff62b676863ea0af3a798d2dd74233753332285c

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