Malicious PDF — malware analysis report

Static analysis result for SHA-256 193d72853c1fef69…

MALICIOUS

PDF

79.7 KB Created: 2021-09-23 20:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05c62740260f12134339e351abf2cbed SHA-1: a6aa58b4c1e58c006b4ef97a29f8bd6fe77ad621 SHA-256: 193d72853c1fef697876851d98d8dc56d9beae76734c2ba9d38fb2ec93ae173b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing or tech-support scam. The document body is heavily obfuscated, but heuristics indicate it contains numerous links and a callback lure. No scripts were extracted, but the PDF structure and embedded links suggest an attempt to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://video-cycling.de/files/file/dekepuborovakomiboba.pdf In PDF document text
    • http://baigeleather.com/userfiles/file/94741855319.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210916185444.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/lurasolebigafilibupamig.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/45819710370.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/rikepol.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/90872603099.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/lalatebowuwogativawoxipos.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/ritimutonifalujosa.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/19697868261.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/74578625047.pdfIn PDF document text
    • http://capri.lt/userfiles/files/jedaxekutewovaxituwito.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/32961188911.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/5271980625.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210911171745.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/72636932372.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/66342975938.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/pojebasi.pdfIn PDF document text
    • https://cncunse.com/d/files/71826916686.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/13736611153.pdfIn PDF document text
    • https://teamcode.net/upload/files/97568403089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=virtua+tennis+4+apkPDF 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_off0000d473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD473 10320 bytes
SHA-256: 6fd5319a8cda2eec98c62b8fe9064310a3bc8e9276e9ab6144579be953474264
font_01_sfnt_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 18160 bytes
SHA-256: 7eaf4645a4f876f4847f844712c78bd8d25f93b95492030a9f743f9e0d125072

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