Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fbba8b07a985523…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 13:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f50381d039eb479f644897aea468a04 SHA-1: 4976a32f4962945057d6c651465518200d502b5a SHA-256: 1fbba8b07a985523974186c66d975f651f1d65f287eb94a272de3eaf3a06f204
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to disposable domains and are likely part of a link farm. A critical heuristic identified a 'Clipboard command execution lure,' indicating the document instructs the user to copy and paste content into a shell. This, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware delivery attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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=deep+work+book+pdf+free+download PDF link annotation
    • http://home-plast.ru/foto/files/ludokamezen.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/16155010427.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/roxepejinifolovoba.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/81887137546.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/7ec41800d827db99ff56eeeacbb4ea1b/pimarilugefogixutun.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/63853081115.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/tudexozud.pdfIn PDF document text
    • http://jainfarms.com/uploads/devurojijo.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/bevunukivokobuwa.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lemesemolavepu.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/taguruwokatofemivakarugat.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/betezixuje.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/61378c576aa5a.pdfIn PDF document text
    • https://iwistw.com/upload/files/jixivofobibetukaziwu.pdfIn PDF document text
    • https://network-italia.it/file/1965906188.pdfIn PDF document text
    • https://mfdesign.hu/files/file/36360829304.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/99457930383.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/76380015488.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/34439428717.pdfIn PDF document text
    • http://mextro.de/upload/files/91811275893.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/velaselobuxuziz.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_off0000eab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 17428 bytes
SHA-256: 764fb24d39a2f4dabf881cd1448ef4adcaad12524d48141458265365562836ce
font_01_sfnt_off00011819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11819 10452 bytes
SHA-256: a0c0d9ab3dc98b920618fe7de0115b3fadeab9a2217a909b6bd179270835587d
font_02_sfnt_off00012fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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