Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c327fe1f99c144…

MALICIOUS

PDF

85.2 KB Created: 2021-09-15 00:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e32fa96bded4832f3b9797252d8913f SHA-1: 91920b196a53e509d488f510d5d6731d2777efb3 SHA-256: 36c327fe1f99c144b7c011f2a0b47fc87d730c43f587586f4511453627f1b81f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially suspicious domains, suggesting it functions as a link farm or a distribution point for further malicious content. The PDF structure and the presence of external URIs strongly suggest it's used in a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://verner.lt/images/files/20041416812.pdf In PDF document text
    • http://formpart.com/upload/ckfinder/files/51410078936.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/pirujujojubixurar.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/wumufuzo.pdfIn PDF document text
    • http://airsoft1.ro/files/file/2722065883.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/mogusavaguxevepamopuveto.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-3/20210903152947228908.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210910054525517845ws67d56fsb9p.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/37261668915.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210910011622090197vbubb.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/nukilenimufuwi.pdfIn PDF document text
    • http://smogy.ru/files/files/lubodevufigaterijeluzanu.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/73534501326.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/semiruj.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/sozetakokugeripovaw.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/58031087028.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/wibofeledajorizumu.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/wesufikisobukajasitot.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/josezovumiled.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3aad37516---62168082569.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348fa1c4e90---69523422192.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/8866412035.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/35544145957.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/62194497176.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/85339267228.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/befikuligigozifeferidevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=perfect+piano+game+onlinePDF link annotation
    • 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_off0000e8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BE 17468 bytes
SHA-256: 3b70b711740e4c86f5a9b46dd87f7ee5fd855b7fee08357fd1d3b4d16fc53b35
font_01_sfnt_off0001164f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E66 10656 bytes
SHA-256: 712664f9eb9f0a70da5c5b4b814054810833173fa2347dd80d7dc042a082ce5d