Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b5bb0ad448a7cb…

MALICIOUS

PDF

70.2 KB Created: 2021-09-27 23:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58bac85e386a3bc4ea3dd0d8b7dfdb61 SHA-1: 237ddac6e9752bb940a99e420522f5fca3bb839e SHA-256: 25b5bb0ad448a7cb35a00f8f22dda2d1af64eaf7f68f48d96cb3c5eb73d60ea0
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to disposable hosting, forming a link farm designed to trick users into downloading files, likely malware. The presence of embedded JavaScript, though not directly analyzed for specific actions, suggests a mechanism for executing downloaded payloads or further obfuscating the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=prince+of+persia+the+forgotten+sands+game+free+download+for+android+mobile PDF link annotation
    • http://printific.com/images/contentimages/files/wugek.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/57595554421.pdfIn PDF document text
    • http://jump360.co/upload/files/20210922183004.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210911171616.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/12563309894.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f700471b---58494041624.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/63396526152.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/13064711129.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/gesovuki.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/21784074194.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/kowozukilasol.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/kitisemofoj.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/bubivuxefokulozupizumewoj.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/53780386296.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/zubekijikovixofire.pdfIn PDF document text
    • http://mylodge-naoshima.com/39702877798.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/sulumatavipiriwebasopovez.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/gesamo.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/xozuviweravolovibosur.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/venurorotaxudol.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/a6f21e3dd55eec04a4a29be689068080/gezojok.pdfIn PDF document text
    • http://mdtrend.hu/files/file/81065601494.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_off0000adff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFF 15872 bytes
SHA-256: 05c5af841d48fbf7c796759222d8da2b7458e78502bbdffd8d12fb20767fc353
font_01_sfnt_off0000d668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD668 11292 bytes
SHA-256: cc7315a72696ca3dfb7c418c05c61d8eb8e2bfcef2a412dbec2e84a0159619c1
font_02_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.