Malicious PDF — malware analysis report

Static analysis result for SHA-256 723850ed7f19c1d4…

MALICIOUS

PDF

78.0 KB Created: 2021-09-12 04:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a63d8acc2e54988317e0295d7831032 SHA-1: eb28999c09a7ea30b26f1d41de336ca53e736a26 SHA-256: 723850ed7f19c1d4cf24c8a685c2e2a90e64b1dac57543244f6b73703d95990f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document's structure is designed to host many links on potentially untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://duproject.com/uploadEditor/files/fakerejaranowituguxeligo.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305bb751f01---ramitutijivow.pdfIn PDF document text
    • http://intertravel.hu/_user/file/31730142378.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210908_5B1D1FF6F29E026C.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/rujatawewuxibamaneli.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/rizujes.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/nofovubabozizovixusatar.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/jupege.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/xoguraxe.pdfIn PDF document text
    • https://best-label.com/upload/files/14344561886.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/gezogofal.pdfIn PDF document text
    • https://uangraja.com/contents/files/zexowumipo.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/70437973013.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/16750126209.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210906140103_YmVydXJldnVwaW1ldGE=.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/subugerewozifimi.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/87470547581.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/00tl9gembtco5lq8gsnkveutaa/37865071751.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/vavuxukafagakifuf.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/bogibikinifoxo.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/wetajaxisezeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=fs+18+hack+free+downloadPDF 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_off0000cc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC19 17392 bytes
SHA-256: 430bb4d91f785ff333b1755929707fc03a1e8e3dac0b47abe1f02bd0134e25f8
font_01_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 10800 bytes
SHA-256: fa733c948d54bf23a7c667a2b6624da37baa3f7bd35235d48f51d8b0df3d5fa8
font_02_sfnt_off00011213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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