Malicious PDF — malware analysis report

Static analysis result for SHA-256 b152c381d7590aa4…

MALICIOUS

PDF

70.6 KB Created: 2021-09-17 21:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6a6e6ad00bbd8e2c5c75acfe0472ab8 SHA-1: 7e78c291b1ff117a934a33ffbb6b7bce24db49ac SHA-256: b152c381d7590aa467e898cc0d3049734da83c99e8e6659c39629096459821aa
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. The PDF contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains, suggesting a phishing or credential harvesting campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.oomewatersport.nl/upload/files/rodebizovisa.pdf
    • http://www.como-grup.ro/fisiere/file/12859122627.pdf
    • http://yds-wcv.jp/free_images/files/givexiwubasirevobidepipam.pdf
    • http://broadgatecapital.com/userfiles/file/zitoxifivagugi.pdf
    • http://kientrucphatloc.com/upload/files/19703879521.pdf
    • http://kadh.kr/bobod/upload/file/25422285348.pdf
    • http://www.majbrno.cz/uploads/files/62756484685.pdf
    • http://avandcie-energy.fr/ckfinder/userfiles/files/16897780280.pdf
    • http://air-ned.com/uploads/files/nudobusowukovor.pdf
    • http://1-cities.com/blog_images/blog_/file/9182918508.pdf
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/xexavub.pdf
    • http://ge-mak.com/files/77384794734.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eea828fac6---31384478216.pdf
    • https://stpatswatertown.org/ckfinder/userfiles/files/53007706287.pdf
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/fexudi.pdf
    • https://aldurra.ly/images-editeur/img/file/63512846671.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/31a7d72f3332075308d52e38da2068aa/65955783581.pdf
    • http://bindashnews.com/userfiles/file/xupugugojuserijup.pdf
    • https://erdenet.mn/userfiles/file/85807686605.pdf
    • https://mimpisiluman.com/contents/files/29381710581.pdf
    • https://dehayemek.net/upload/ckfinder/files/64528064527.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/vogewoguxutuxug.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/81796634174.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ben+10+undertown+chase+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b31c.bin
0a6e6fec82c616922ecbb69198825d93ee1925d8215ecd7aabe85b1b92a43417		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB31C 11148 bytes
font_01_sfnt_off0000cd1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1B 16792 bytes
font_02_sfnt_off0000e52d.bin
584340fe8df5340355218a41b7311b3ed522eddd0a4e22f91a75dca33e2e1b58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 15572 bytes

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