Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd64e00326d74f6f…

MALICIOUS

PDF

86.7 KB Created: 2021-09-13 15:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 182d40b8a4e349775fcc78c4c5141816 SHA-1: 1715768e0c6b42e1745c65d9a0c127c520ba5f7c SHA-256: bd64e00326d74f6ff9049761e917f3b836867f3e2ecff79e4c4d0bdb44fe469e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with many pointing to disposable domains, characteristic of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the PDF is used to redirect users to potentially harmful content, likely phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.medic-pneumolog.ro/fisiere/file/48575344540.pdf In PDF document text
    • http://splhardware.com/UploadFile/file/2021090512260473499.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/24952114007.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/76499115691.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/zuguritipekikenurodaman.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/72058979913.pdfIn PDF document text
    • http://klemanpince.hu/files/file/79408230027.pdfIn PDF document text
    • http://strahyi.ru/images/file/wudumulu.pdfIn PDF document text
    • https://hinaweb.com/upload/file/3492204598.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/4465872740.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/91538472093.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/75488202708.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/42824797957.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613935503f69c---77655688892.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/46425705744.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/jugomimedo.pdfIn PDF document text
    • https://cargotavio.ru/files/file/jagozilu.pdfIn PDF document text
    • http://linker-apps.com/files/41797649647.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/54e06dc3057f8f0b9bb3406ab1dd5dd7/gesuzefemadabiwera.pdfIn PDF document text
    • https://svltv.in/userfiles/files/55378934219.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/nezipupe.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/6860089405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cast+with+firestickPDF 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_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 19440 bytes
SHA-256: 8324da0ff80cf90c0f096f6d04cc9691b15431daf2ebdcd996703478f40428b3
font_02_sfnt_off00013581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13581 10372 bytes
SHA-256: 7d0eaa0c746f017ac3a20429be5d995d610228552cc4b4fc0739affca9a825f1

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