Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4e02d706ad3f82…

MALICIOUS

PDF

73.7 KB Created: 2021-09-27 00:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97ed50727bdd22afb54462a8c2a0fb60 SHA-1: 0ece1bc38cf2a321fa86825c36cff755087fd332 SHA-256: ca4e02d706ad3f82c476ed50edb5c95bbb35037c9dd40e6a7cc6b2d13f9b11ae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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 http://ping-property.com/user_img/files/13798154858.pdf In PDF document text
    • http://tsnpharma.com/upload/files/20789141566.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/vawixoranogowuxurudedozik.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/22792119381.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16150e4637d023---riwujodu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d806dfc27---tefejizoniraresaborix.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/dexiwufadevexivup.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/93034110041.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/zikox.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/bokulesobidawe.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/1135717123.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/volesumi.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/54462104488.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/kezuworifimuva.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/jorabenozolare.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/15780851754.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/dekukokafox.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/kisezexeberowisukew.pdfIn PDF document text
    • http://dongphat.net/upload/files/rifejuboperekuxud.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/26998122942.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/nedapalirisarutod.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/jemizaxiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fundamentos+de+auditoria+juan+ramon+santillana+pdfPDF 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_off0000bb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6F 10868 bytes
SHA-256: 94de653996958415569d5870842d3b18dfaa240ed94517fd5764642c9850645b
font_01_sfnt_off0000d474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 17364 bytes
SHA-256: 212015bad6fd46ef37c30a65e69c43d355de6447472a917a559e8e5286637447

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