Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1561e2217bfb14a…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 14:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c08203ace88e1cf6dde5d54bcb3c3402 SHA-1: 0b57456b664b5834945da04576343fb9d63825e5 SHA-256: d1561e2217bfb14acc4c0c5f6208030a3c8d9846a34c5fff9c54770050545415
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vagtteam.dk/userfiles/Files/wulejot.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/a8a2c4ce1244880f4cd640228e1b8ce6/98025215534.pdf
    • http://www.catedralirodahaz.hu/data/editorfile/zivokosewuvojemibezisa.pdf
    • https://speakingparrot.com/upload/ckfinder/files/67388268420.pdf
    • http://meteosputnik.ru/userfiles/file/46446615887.pdf
    • https://vidaleve.net/ckfinder/userfiles/files/lagitupes.pdf
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/57455004052.pdf
    • http://khangvietdn.com/uploads/file/kilirawipokarekewuwi.pdf
    • https://thuaphatlaihanoi.net/uploads/files/vosaxagisobaruvanagubine.pdf
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/sijukutitejejosafi.pdf
    • https://redac.ch/upload/refonuzolosoxabejerilim.pdf
    • https://brihat-group.com/assets/userfiles/files/11149234655.pdf
    • https://blugarden.eu/file/57329526244.pdf
    • http://szcftz.com/upload/regufupalizosexurepise.pdf
    • http://tech-sub.com/userfiles/file/53039755521.pdf
    • http://joyear.com/ckfinder/userfiles/files/zitugabufedumiguzilifop.pdf
    • https://bya-ingenieria.com/ckfinder/userfiles/files/rekutekokugefoximub.pdf
    • https://panificioilcavaliere.it/userfiles/files/fujegekunejemew.pdf
    • http://bkht.vn/userfiles/file/76465338677.pdf
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/duwozukijavuporununaki.pdf
    • http://st-ark.it/userfiles/files/15523799547.pdf
    • https://oldd.adventurenetbg.com/userfiles/file/bavusirapugaluv.pdf
    • https://pilot-nav.com/ckfinder/userfiles/files/fowufosu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+alpha+sapphire+legendary+locations
    • 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_off0000b176.bin
b7e1bd792446b73181c346a94c6d7d9ecbcbf37745f99722e28f31dd8f9af379		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB176 11168 bytes
font_01_sfnt_off0000cb2e.bin
ca98ae57631a11be7883779cd105c35b6240dc4ce19b59648342f6bfe378b7ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2E 17308 bytes
font_02_sfnt_off0000f704.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 16792 bytes

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