Malicious PDF — malware analysis report

Static analysis result for SHA-256 db03fb841e1a59c6…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 17:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 269b87ada4816f57b5c2984e1fe4d922 SHA-1: 524f7acac951fca05868c59215236e322e5c6209 SHA-256: db03fb841e1a59c6eca6d28876ec8c1e1998ede90762232b7b63f151bff5a2fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF format often utilizes JavaScript for malicious actions, and the presence of external links suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://egokituz.org/files/galeria/files/89236546852.pdf In PDF document text
    • http://phuvuongcorp.com/luutru/files/lufebavorusejakoporuje.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/9027287846.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/suwozarubakujikibojote.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/49413966147.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/visumizivumoto.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/77960409900.pdfIn PDF document text
    • http://orthodoxnews.us/file/xekudajavukewe.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/34637264688.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/58176105148.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/68c24c9223a1ea3b3fdfe99908b76ce7/50452606998.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1631080384186611808.pdfIn PDF document text
    • http://186086.com/upload/files/somazepezebowozemozopota.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/sidewufazowekukesurabo.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/jaxomojenuzuful.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd73ccae8---sulefugapurologafe.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/kemomuxomijavulerutolon.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/jigapubefudefore.pdfIn PDF document text
    • https://chptravel.ir/data/file/jutiveluvuwori.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/16055506991.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/73559070495.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/51903334012.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/wudivejudeji.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/81323264374.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/subep.pdfIn PDF document text
    • https://eniedu.com/data/file/20210906190430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=nebulosa+planetaria+pdfPDF 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_off0000d5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C0 10708 bytes
SHA-256: f57149af3d02693c2b6ab746aba0b22f0ddbef526e7ead3872adcce7f85ecb30
font_01_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 18784 bytes
SHA-256: dd64a00a63e5daea517d75e5946b5e4dfa90294a075f68e268135adfa48eaee5
font_02_sfnt_off00011e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1