Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92b4a76b8346d91…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 12:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7414089487a3ae97a7ee60d2d6f463d5 SHA-1: 2a5ac29b2f2bdfae6a8d4989c9cec5bca955a69e SHA-256: c92b4a76b8346d91692604f9373b19093b223d550f0aac8bc94638cbeeb2619c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and the presence of many external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wastran.ru/uplcv?utm_term=how+to+save+google+maps+directions+offline+iphone
    • http://ballarioarchitetti.eu/userfiles/files/sitavizibupo.pdf
    • http://nemdanangpho.com/uploads/2021-09-13/images/files/nabisokorofajuvedipe.pdf
    • http://svatba-emi.com/uploads/pages/files/wujubiza.pdf
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/panazosajakexirobanejo.pdf
    • http://imosa.asia/uploads/files/202109012231021955.pdf
    • http://clean-ecology.com/Upload/files/71862603887.pdf
    • http://wpscrm.in/uploaded_files/userfiles/files/29905738136.pdf
    • http://galsabino.it/userfiles/files/wisufafetudiba.pdf
    • https://takipcisec.com/calisma2/files/uploads/52389465297.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/epbu196kcdg1ar8h0trb5840v2/wolob.pdf
    • https://urbanlivin.lu/userfiles/files/mamalamokuvejobu.pdf
    • https://foulardfotografando.it/file/31331728899.pdf
    • https://estatecambodia.com/htdocs/cljr/data/files/deguwaguguje.pdf
    • http://jdjcnc.com/upfolder/e/files/20210905003207.pdf
    • https://bosingels.nl/ckfinder/userfiles/files/nakamajibuvamusuluto.pdf
    • https://zlatartopalovic.rs/files/39796932742.pdf
    • https://wfca-czech.cz/temp/userfiles/files/15969446686.pdf
    • https://cubic.is/userfiles/file/73266819063.pdf
    • https://confeccionesruiz.cl/UserFiles/File/jimodanamugolugegab.pdf
    • https://yunglin.com/uploadpic/files/jodewawewasukibafo.pdf
    • http://studioesflores.pl/obrazy/file/71593323488.pdf
    • http://didongsinhvien.com/upload/files/lafisarosapa.pdf
    • http://artgrafika.cz/userfiles/file/vovasunowadodipujananuw.pdf
    • http://conblocmanado.com/pics/file/543343195.pdf
    • http://creativecoms.net/userfiles/file/ririrokoxolebadunavifuxi.pdf
    • http://pk.mo/userfiles/file/62179741381.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_off0000da50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 16792 bytes
font_01_sfnt_off0000f262.bin
7f9932b27989c5a6a0ba5400508d9d4b6e27c1c021424ab327259deeb1f97f58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 17096 bytes
font_02_sfnt_off00011e3b.bin
6b081afe8eeb25dc49226eedf9bfab09a8a96f2778f0cc13374061963a266b09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 11208 bytes

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