Malicious PDF — malware analysis report

Static analysis result for SHA-256 5653f07f03cd0084…

MALICIOUS

PDF

87.9 KB Created: 2021-10-07 12:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a256afd1f77a324a4262029cdaad92ce SHA-1: 79d3419f9c84497c322131a8d652f99ecda25188 SHA-256: 5653f07f03cd00846a75ab258f23cf1fb0c90a844feba09da9705c3c7c6ce1de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs, with one notable example being 'https://drafthe.ru/uplcv?utm_term=beautiful+drawing+oil+pastel+colour'. The presence of many links on disposable hosting suggests a link farm designed to redirect users to potentially harmful content, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://drafthe.ru/uplcv?utm_term=beautiful+drawing+oil+pastel+colour PDF link annotation
    • http://crescentcarpets.com/userfiles/file/35131053523.pdfIn PDF document text
    • https://digicpictures.com/downloads/92142561727.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/29009476511.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/73328200228.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c89084bd28---49041114307.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/36446298368.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/xususukikuda.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202110070149151279.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c09f55ce43---jolaji.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/63061284574.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/nakogezugo.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46474513569.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/jizutoriniwaxew.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/75930979366.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/latala.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/kisowirivemelopew.pdfIn PDF document text
    • http://101balkon.ru/upload/files/25547563275.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/1738092003.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/gimotumi.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/tezelaxezikagewazazi.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/sakaz.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/67017086212.pdfIn PDF document text
    • http://praguetransfer.com/files/file/zuganamaz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 17608 bytes
SHA-256: 06cf5d1895388dc20963b834221c13d61617ed9d44d028d834ede18b68975ddd
font_01_sfnt_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 11032 bytes
SHA-256: c5e92a59a997632e19692b8a45d7935be4590e7b6ae73ca20a6420f4101d223c
font_02_sfnt_off00010afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001230e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230E 18176 bytes
SHA-256: de7c965186ec5d2e0225ddf2973462790834d0b25f8f6f41ba919c2c4d058c81

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