Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23f67bb69b94786…

MALICIOUS

PDF

83.1 KB Created: 2021-09-22 13:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f8a25fb9853fa1bb7d5e519f259a87eb SHA-1: bcd4d30ccee229606d1b82696af2075c70fa10c2 SHA-256: c23f67bb69b9478671363efa74be926cc44172c528cf723923f0ce4ae13d7631
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing or trojan delivery mechanism. The presence of external URIs and the link farm structure strongly suggest an attempt to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=best+driving+map+app+for+android PDF link annotation
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/salatuloporufabobakase.pdfIn PDF document text
    • https://windsbs.biz/files/file/kegefub.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/vutanaxuworumiwaj.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/25263063018.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///63820898887.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/92226989656.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc07e89620---14646247618.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/gazejatamuverata.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/22669193532.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/rukakibipezofefowogadoxib.pdfIn PDF document text
    • https://comfort8889.com/upload/files/goralagejito.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/78427834285.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/11342987213.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/13279841285.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/pizisaxudajafa.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/71888249781.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/viduxufifewazixi.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/lomezapijawa.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/rasugiluwit.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/xowegabo.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/48925225004.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/juxaxu.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/65341738773.pdfIn PDF document text
    • http://hijoin.hu/editor_up/jasutidogabibelojamikuneb.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///medozugofevulujedimuz.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_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 17324 bytes
SHA-256: e3b2b41ae4df65592aa230b403a2b102f317213d1cf6243bd9ef7019652901f3
font_01_sfnt_off00010d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12544 10912 bytes
SHA-256: 0de4ded4c362f050c1f56267f269c779b4e3df879deb06f33d22255795f5fd1b

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