Malicious PDF — malware analysis report

Static analysis result for SHA-256 0240ebcd01437768…

MALICIOUS

PDF

72.7 KB Created: 2021-09-16 21:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c1f314b3b6a17851a4012a18afa011ae SHA-1: 1d892206f4ff909f7de94103ba00febcd6c532bc SHA-256: 0240ebcd01437768f44b1d7e32743f7829ebaf8190f3312968537b39206d28cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were extracted, the presence of many external links suggests the PDF is used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kutscher-customs.de/gfx/userfiles/files/wejexumagoxaget.pdf In PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d49a830a9f---21660126829.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/berazumovogufub.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/tusokemazilasi.pdfIn PDF document text
    • https://tivicom.vn/upload/files/vefijelidavaloji.pdfIn PDF document text
    • https://denimder.org/resimler/files/fivanos.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/nupofabigikulopedejixa.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/kesenasil.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/xasulinuf.pdfIn PDF document text
    • https://costarica4d.com/contents/files/35809546806.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/gazotojane.pdfIn PDF document text
    • http://getdol.com/page_data/file/xomuvitodegolugi.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/50340138837.pdfIn PDF document text
    • http://firegallery.ru/img/upload/nebubibixedarojib.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/josufidut.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/72848574584.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/fa43037f281e758985a2c05056e71302/baroxajajerir.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/43953143049.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///35437265104.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/tupef.pdfIn PDF document text
    • https://aaaxxion.info/images/file/momegu.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/pureruwesubajo.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///38968302295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=app+para+descargar+apk+gratisPDF 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_off0000b867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB867 10492 bytes
SHA-256: fd11201cfc8062b8bb2b7c2f6681d8807b2d09e78b6e1cb999504b5483d860de
font_01_sfnt_off0000d03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03A 17872 bytes
SHA-256: 517f42de5acee838462313e4b61f0bd626a5ff84993dac5293665975e5ed52c9
font_02_sfnt_off0000fd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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