Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d79d503cd151785…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 23:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5fd1cb736fcd9b78f8b4ae5c3c03d74 SHA-1: c934907a69f284dbefd058cc86116116893cff3b SHA-256: 6d79d503cd151785647bd8a82d829e5cfd4e2d42bd46774f26b03e36e1b08338
166 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious. It presents a fake CAPTCHA or human verification prompt, a common lure to trick users into executing further malicious actions. Numerous external URLs are embedded, suggesting a link farm or redirection mechanism to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://lokalsport.no/userfiles/file/rekizisurelofenegewetoj.pdf
    • https://mytopics.it/uploads/file/xapofetepamekuzogalumil.pdf
    • https://accu-split.com/userfiles/files/jovebadinopasogu.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141a4c315e0e---48074062411.pdf
    • http://rydelko.pl/userfiles/file/junuvezu.pdf
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/letod.pdf
    • http://fxlcd.com/upload/file/nifeva.pdf
    • http://life-worldwide.org/assets/uploads/files/kukavekutiponakivolajej.pdf
    • http://clairvoyantinfotech.com/demo/images/58153821313.pdf
    • http://velapower.com/glwh/UploadFile/file/2021091519174173499.pdf
    • http://cameralehiep.com/hinhanh_fckeditor/file/14179494808.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dccd1cc84c---xafijadawoparogefoxuv.pdf
    • http://spzpoz-zdunskawola.pl/upload/file/24114278176.pdf
    • http://terralis.eu/catalogue_dynamique/file/61731746353.pdf
    • http://dailygiasi.com/uploads/userfiles/file/74884206864.pdf
    • http://worthingtonpark101.com/userimages/kuwaxamitonoxalemim.pdf
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47014506276.pdf
    • http://www.jindatunnel.com/up_files/file/pepoko.pdf
    • http://loadcell.vn/Images_upload/files/biwaladiwo.pdf
    • http://nextlab-semi.com/files/fckeditor/file/bixobopuziguxunonikurif.pdf
    • https://opsclown.it/ckfinder/userfiles/files/puvupilakufokapajutes.pdf
    • http://aimic.com/userfiles/file/3227056491.pdf
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/nigusufatenagiw.pdf
    • http://icmasistemas.com/userfiles/files/24477499371.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=gta+v+without+human+verification
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ca.bin
b6ba817ce3c43bd99191dd9bf224b151eb3e5ade11a2221d64a1726bbe5b2750		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CA 10676 bytes
font_01_sfnt_off0000ed2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 16792 bytes
font_02_sfnt_off0001053d.bin
c744cf067e0d23c5486f10ca517aa5347eeb7c4d9058cee08d894c55d3c7dbe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 18616 bytes

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