Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1906dfec7a999f…

MALICIOUS

PDF

71.4 KB Created: 2021-09-23 12:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18fcbe8d7a4cb24896cfd9acc40997d0 SHA-1: ad96f75deae5df7a92525b1f580a8da79e347672 SHA-256: de1906dfec7a999f4a79f80cb0fdee4b082c4dbd0241e01f3533ae9f698854c3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=four+letter+word+second+letter+o PDF link annotation
    • http://solo-reisen.com/media/images/file/56793213430.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/pikipud.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/59030897768.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/37260148311.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/5320408322.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc0f988f93---88240159818.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/laboxajopozapizavu.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/46053114104.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/xuvawepul.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/weratan.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/vowewasagev.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/59971695175.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/27123514086.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/mirimunafowutavopolije.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/redarazinovitav.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/95081365351.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021091906453898.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/64782135528.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/gugafozunomuterepisesoz.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/kezigelagotexu.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/50226488452.pdfIn PDF document text
    • http://mweb.cz/images/file/kufabatatatarubet.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/78223906233.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/38115456313.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/sizobesixopub.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/gevaper.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/f0otka593ff5ahtij9mjubvlrm/72546285696.pdfIn PDF document text
    • 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_off0000ba3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD250 15068 bytes
SHA-256: 3a1546c0b617944981bde1b9a74c5908f8fb567cd57d27e625c21e502f3d7c0f
font_02_sfnt_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 10272 bytes
SHA-256: 3dc2c6ee1dd9dbcf013a0476b1eaa4b9e0ddeffe2c5dea3efa1c405a9d56f11e