Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e45a86d490276b…

MALICIOUS

PDF

72.6 KB Created: 2021-09-19 21:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 705dbbd3714ad528d7d45160eeb8d1dd SHA-1: fc2d9cd40ba5a4ee2a6f80e012d5f69867cbe56d SHA-256: 53e45a86d490276bc0be50a797807212dc3233325bd6d2c7ff286e56500a9f0a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into downloading an encrypted payload, likely after being presented with a lure. The 'Callback phishing phone lure' heuristic further supports the social engineering aspect of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/67867097034.pdf In PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/loroninimeve.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ee6t20docekv6co5dg84aj5hd6/jarobosefinogi.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/45067293250.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/wizubijemakewalagikutulut.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/xawapimomejoresukujobupow.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/nexovu.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210909105841.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/45435220410.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/basafinizadusal.pdfIn PDF document text
    • http://lactopad.com/uploads/files/60418257526.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/pepejuv.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/78382036594.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/muperise.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210908_028316BC16D20614.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/rabiwi.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/bawazatawebogubizaxo.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109081159086611.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/100577899.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/28940244601.pdfIn PDF document text
    • http://eksternest.be/images/file/72725035247.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109072204297269.pdfIn PDF document text
    • https://airxps.com/userfiles/files/lerobifokodibe.pdfIn PDF document text
    • http://ranch.pl/files/file/tolekabageteso.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/38135965379.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/juxunawenifetogatofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=phantom+forces+script+hackPDF 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_off0000b977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB977 10792 bytes
SHA-256: 309355f4f397cfd841df6e7a96b56856803a3003238babdc213bdeef652102cf
font_01_sfnt_off0000d222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD222 16692 bytes
SHA-256: 1b5896c297103a882dd09b47f1153f2848b071c02d6fd0c3c4deb238e8c10f80
font_02_sfnt_off0000fcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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