Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ae8dd08f6a4736…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 19:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: adac505a0a406d5de4fc4557e7dabb5a SHA-1: 78f802e60b583d6a3beb9f2057c3a1240e516ce6 SHA-256: c3ae8dd08f6a47366b7dd29452a8dedfa508c97df056681c7ca1837e25e3973b
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to link farms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The PDF structure and embedded links suggest an attempt to redirect the user to malicious content, potentially exploiting vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://hani-bee.com/userfiles/files/2617654561.pdf In PDF document text
    • http://www.mostex.sk/files/articles/file/57552120201.pdfIn PDF document text
    • http://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/74957276068.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e15b41a51f---73227163165.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/kuzizapasu.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/wipubusobawabawid.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/tufivivitufopur.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/3269763453.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/55770445337.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/2182421393.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/41774963699.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/narifetitosagimebube.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/guguremisukifos.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/podoxifiguxa.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/53355989609.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/73365934144.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/datorunapajekaluvubusi.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/piruxozitipuna.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/doturatug.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/wemabotufokutitepug.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/wadezejoj.pdfIn PDF document text
    • http://wych123.com/upload/files/kagod.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/66140950993.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/mepewupotitezapopubav.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/bugosimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=streaming+after+we+collidedPDF 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_off0000cb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 20924 bytes
SHA-256: 4931c347442d4d8d6e0efd513622eea74eb3fa1a0ed58cb35305d40b4228029e
font_02_sfnt_off000118bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 10812 bytes
SHA-256: 358b5053684af34023091856b32c8ceab17bf24ab88e82a84fec784465c62314