Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1bb99c322b3021…

MALICIOUS

PDF

73.8 KB Created: 2021-09-17 12:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04d079540e18285e797bdf5bcb509672 SHA-1: 9374c13b5a9f247d5abb6cc51f64d0b0a77b6b33 SHA-256: cd1bb99c322b302179dcdf9800fc672b36339b8fc51213f5dc49e1ff3e1077e4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs, including a link farm on disposable hosting, suggest a phishing or malware distribution campaign. The PDF structure and embedded content, while obfuscated, are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://huntic.ru/uplcv?utm_term=game+truck+simulator+indonesia PDF link annotation
    • http://regmac.net/userfiles/files/wizenug.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/61599646918.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/zevopupadikokotokeki.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/34734183662.pdfIn PDF document text
    • https://diphong.com/uploads/xeduxilimabotobokesi.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/55830958410.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/50078647126.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210914_697AE7814F4D4057.pdfIn PDF document text
    • https://icbacademy.com/upload/files/24905135745.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/wenop.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/limamotowujesagi.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/porotuwovemiliropaxuvok.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/zoxisa.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/5748498781.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/93591851118.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/38241082081.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/gunobafogawutimusadiza.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613207fca7fca---85958242560.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/kureje.pdfIn PDF document text
    • http://epmachine.ru/d/files/90586013281.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/dixeneluzefowifazijebulo.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/towawakavaxexoxumuja.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210901211348.pdfIn PDF document text
    • http://lamay.de/userfiles/file/tetatozolisiketo.pdfIn PDF document text
    • 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_off0000bf5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5C 16232 bytes
SHA-256: f2ca3ecb7e6ca37b423a80f274b89239787a4fe80e5800d8fc5fd26ab8af58f2
font_01_sfnt_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 10760 bytes
SHA-256: 190d503ac720a962aab7571c11beaba50d415c4e2bb80a3392081b2e7c726808