Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8da9dd7a683890…

MALICIOUS

PDF

78.1 KB Created: 2021-09-11 22:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b50bbf8c03937f54c9737c7792ccd6a6 SHA-1: 3eb2caf1a17984e83d2c4c7b839c755620cff9f2 SHA-256: 8b8da9dd7a683890311303350c6aac681e9128f69c89cd384e193d5055772b81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely used for malicious purposes, such as redirecting users to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://pmke.cz/pictures/files/ziwibujowakokuwaduv.pdf In PDF document text
    • https://mywayrtk.com/userfiles/file/fotigixawogopalulusugaje.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/43434894515.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/15296115508.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210904004944.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/fixajufufobi.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/xarelewi.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/63397016218.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/xibipixinad.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109021408244206.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/68322535719.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/4091634912.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613165828bc20---pagiwesipijajedumiv.pdfIn PDF document text
    • http://egitara.com/upfiles/files/nilatixefe.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/59288341190.pdfIn PDF document text
    • http://creationart.hu/files/file/darutinogunogurilimup.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/324752308.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/vinigavo.pdfIn PDF document text
    • https://mcsfood.com/images/file/tonuzegawigaxog.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/35258553182.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613754b4c9439---97367519685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=kpn+webmail+androidPDF 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_off0000ca7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7A 10504 bytes
SHA-256: b01624caffe7ad2b191d1207788b41a697d669a2c0045387b8e8bd591479b160
font_01_sfnt_off0000e20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 19008 bytes
SHA-256: 29d0c099f0874452a79c165dbcd5be4c4aba09165df514f5f7aef7cc44ee56bd

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