Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f50cc1292be4eb…

MALICIOUS

PDF

73.4 KB Created: 2021-09-12 01:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8b2b405d0dcac6f01b95c9bce7c5b7c9 SHA-1: 3c039a6396c66084e57b296455a0770b8ab7c78a SHA-256: f2f50cc1292be4eb0e2375c71e8442825bcfb0a9e2b7769289ceabbb06c3f223
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic strongly suggest a phishing attempt. No scripts were extracted, but the PDF structure itself is likely used to host malicious links or content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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://meandnetworking.com/ckfinder/userfiles/files/tanegofogulekuwozajimaf.pdf In PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/26841758682.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/natakunafawovelibo.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/zilewunarakorifatozepomov.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/16519842528.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/11044851952.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/lumamokinufipof.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/11290621197.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/bibawevugoboboxovagad.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/nerarezigimule.pdfIn PDF document text
    • https://nistd.in/userfiles/file/pegolo.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/50843385262.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/45405156320.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/xadudirojovez.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/99023390515.pdfIn PDF document text
    • http://thepducphat.com/upload/files/mijotoposebenijaja.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/51423951262.pdfIn PDF document text
    • https://onwater.my/uploads/file/jatagaxosago.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/wobifogepumiwexagisenar.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/73328684886.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/90415423756.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380a3c06840---zafomusabikuwumipu.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/68351730062.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d0535cf5---88129469148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+operating+system+for+android+boxPDF 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_off0000b911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB911 11204 bytes
SHA-256: b4bc64822aa8c4eaf20d32250326b5a4138f77b356cba868b8d34a9d450608e6
font_01_sfnt_off0000d2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 17244 bytes
SHA-256: 295207cf28383ccca54135dcd87ec0392fb30dbba9e80ed1933d8f077e996b93