Malicious PDF — malware analysis report

Static analysis result for SHA-256 3727473ce16118cf…

MALICIOUS

PDF

74.1 KB Created: 2021-09-19 06:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d39ba4e7dca4814a0f7f2f2e18dcb3e SHA-1: 74ca1ea4c80eb417f144b3eeb6d73ee767da625c SHA-256: 3727473ce16118cf38550c366ba6eeda4c9eace007eb48f60a31fa2c87a5f2c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs align with common tactics for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://catamma.ru/uplcv?utm_term=close+apps+on+android+tv
    • http://misr-consult.com/userfiles/file/89796916327.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3e83fc98b85b724b439675b730f8e574/roduroseve.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/79301406564.pdf
    • http://zoldjogsi.hu/uploads/files/21454793797.pdf
    • https://woft-dining.com/webroot/editor-uploads/files/viwufikaba.pdf
    • https://cartolmania.it/file/xujazuleboribikef.pdf
    • http://houselandia.ru/files/ziminekitutugupojixixa.pdf
    • https://siliconautomation.com/userfiles/file/zelapisi.pdf
    • http://pokewaveanaheim.com/uploads/files/liwevotav.pdf
    • http://wajl.net/img/file/20219643251.pdf
    • https://dalycity.com/wysiwygfiles/file/84276984251.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/1misjl37kjcnahkmvd818kkl54/47855570712.pdf
    • http://0975811252cool.linker.tw/files/rofuwulazugimejowe.pdf
    • https://hideab.se/tc/Mediagalleri/file/miviwifamovisezuserojewig.pdf
    • http://cambresisemploi.fr/ckfinder/userfiles/files/65445837514.pdf
    • http://fpole.ru/sadm_files/68261496948.pdf
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/5270055241.pdf
    • http://yusungchart.com/userData/board/file/3138945043.pdf
    • http://bkdesign.ee/userfiles/file/49992446139.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/jivenovukemolumibowi.pdf
    • http://epwuae.com/userfiles/file/13353157362.pdf
    • 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_off0000c11d.bin
24210a8d13efc9d4d0b1e10de1ca2fe95c85a5f884638a6fca814dcd7c2e8e46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC11D 10480 bytes
font_01_sfnt_off0000d91a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD91A 16792 bytes
font_02_sfnt_off0000f12c.bin
f5937fc56d4d9de5a72db9847a4f7c868a837d9d2cb15f0eb9ec48dc9ee6bf30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 16308 bytes

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