Malicious PDF — malware analysis report

Static analysis result for SHA-256 af441f7a802afce9…

MALICIOUS

PDF

90.7 KB Created: 2021-09-16 15:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 625fa703d1ab0a63d9033bf94a3d412b SHA-1: 0643e535f6cca1666ff41d8464cdc1c6ffb1b05d SHA-256: af441f7a802afce9ae55135c5c2e81550741caf62bef8b6cc3ec6a0ebd12c8c3
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs point to various domains, many of which are likely part of a campaign to distribute malicious content or phish for credentials. No scripts were extracted, but the structure suggests a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://elektrostroy.kz/ckfinder/userfiles/files/dufedotapeziregizizobo.pdf In PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/90196410344.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/sifibizevuvanepilipip.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/tujufoduw.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/sofuvemewejadajumuvu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/42c68b3c38493c190f9bc6f5cbeead81/80127286607.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a54ee1533ed5d89947747d753eee3b53/xetexokasavanubatewogaj.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/22563995133.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/9007604731.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/mavunokazedilakog.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/wesemonazopoluv.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/26150564592.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/givuzodazopewikimuxejejaj.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/disotuxibisujoxoxejuzam.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021951645176516.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/61921421818.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/44938256025.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/19760059075.pdfIn PDF document text
    • https://mkart.it/uploads/file/50824967187.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/51052433560.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/66846654294.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/nujikegopigameguvodurisaf.pdfIn PDF document text
    • http://langmypham.com/luutru/files/50075836630.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/40846911988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fifty+shades+of+grey+online+moviePDF 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_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 10956 bytes
SHA-256: d0846358bd004920c7ce3e8d199146d0ea1f6eb51442eaa0b1b24faed0b1eb2b
font_01_sfnt_off000115d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEA 18408 bytes
SHA-256: 495cc484a2fcf2b05eeb52762388ec05a43ca6e4faf750201e1407a266f8643d

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