Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc52177ace17a93…

MALICIOUS

PDF

80.3 KB Created: 2021-09-10 20:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cf64e1fbbc887bc27fd447b091c017c SHA-1: 0f9759d034d9fc245cd0b0f76741ec289d44693d SHA-256: 7cc52177ace17a93f39787896ad4e8a569cd30b705a5e59ff8bd120b750d222b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or redirection scheme. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing or trojan variant. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the intent is to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://catamma.ru/uplcv?utm_term=cara+setting+email+outlook+di+hp+android
    • https://solucionaesp.com/ckfinder/userfiles/files/dipedenoso.pdf
    • http://diadiemvui.com/upload/files/bupikogaletuguwazanonit.pdf
    • http://cssh.es/img/file/46793204468.pdf
    • https://paperland.bg/uploads/file/27236219109.pdf
    • https://drrajanmahtani.com/userfiles/files/45466523049.pdf
    • http://uptownfallschurch.com/uploads/files/89687294801.pdf
    • https://chongtham68.com/app/webroot/uploads/files/69425031820.pdf
    • http://gernano.eu/gfx/userfiles/files/fibowujibonoki.pdf
    • http://cesishotel.lv/res/wysiwyg/file/50170560613.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9c92af24---pogizozifek.pdf
    • https://dukra.sk/editor_uploads/files/56043051130.pdf
    • http://nc-israel.ru/upload/files/vowiginagiwebepoxipif.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6ffa0d95---25749187915.pdf
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/tuxewepobanojojuromolup.pdf
    • http://abwingssuffolk1.com/uploads/files/roluvekapogupagikurema.pdf
    • http://www.civilhospitalpalampur.in/img/uploads/files/1237999260.pdf
    • http://ppogrimall.com/upload/editor_image/file/darerijaxi.pdf
    • http://cjmfgx.morefriendship.com/upload/files/61082268026.pdf
    • http://bukharaalpharetta.com/sites/default/files/file/najukimazomonu.pdf
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/89984432636.pdf
    • https://eguiders.com/uploads/22725759111.pdf
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/vakupofisumopezipa.pdf
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wenugozikalevedigobejiw.pdf
    • 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_off0000d46f.bin
dd241d1a8063b3a2ebbc6c5db93e8b45e9ceddc73702382377505ca8ad59e100		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 11060 bytes
font_01_sfnt_off0000edc7.bin
b9dc89110fafc593b8600e147c89549fed4adfdc0fdc34bec46a77f95d5ebe47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 17896 bytes
font_02_sfnt_off00011b60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B60 16792 bytes

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