Malicious PDF — malware analysis report

Static analysis result for SHA-256 018b5666346baee9…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 17:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a6a70f919a67d688468c441115f081f SHA-1: 73186c21fa4b924759e7048eceb3d92ec54a47a6 SHA-256: 018b5666346baee9d6f67bd7577ec895bd6f8d5a381866a2c9871d319de86e87
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of callback phishing or tech-support scams. While no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content or facilitate further compromise. The presence of numerous links, many pointing to potentially disposable hosts, indicates a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://denda.co.kr/ckfinder/userfiles/files/gipadoxubabidaraleka.pdf In PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/bizelupav.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/dexuradisorogekiketo.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378ec469be3---dugomazugoxapawelivise.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/82708738.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/zixukalorawed.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/fudipiw.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/45087537959.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/25074040916.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/44383251586.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/kukuvowok.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109140628335613.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/jerawoxemi.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/tofeped.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/68850801169.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/27067360985.pdfIn PDF document text
    • http://didula.com/img/file/siwoxano.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/38902683202.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/razabasuwadenuvagenoje.pdfIn PDF document text
    • http://davcpundri.com/css/file/39279162104.pdfIn PDF document text
    • http://klhl.com/userfiles/file/26271412719.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109091155098585.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/ziduwo.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/xuguvadevoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=iphone+11+charging+watt+supportPDF 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_off0000d8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A5 10796 bytes
SHA-256: 9fcafe9a0181a471345e8adcf3a132c4fd47a31291750985590b802862bf75fb
font_01_sfnt_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B7 17744 bytes
SHA-256: 58544ba2ab67d8f46479ecef048ab4ae9c979736677fa01ac7de09e42fd6a64a