Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b86ad5df49bc22e…

MALICIOUS

PDF

70.2 KB Created: 2021-09-11 09:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7283342aaab467e0b0fb329d38c026a0 SHA-1: 1e8c1bb56573f719eb53b78d619d68ef40d82ffc SHA-256: 8b86ad5df49bc22ec8868ca5073370a28f5e7123e78f08f6d8597f9512b10639
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with a critical heuristic firing for PDF_JS indicating embedded JavaScript. This script likely facilitates the redirection to external URLs, as evidenced by the numerous embedded URIs. The PDF structure and the presence of JavaScript strongly suggest an attack pattern involving phishing or malware delivery via a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://restravel.ru/ckfinder/userfiles/files/waxabisemejivikawajesibu.pdf In PDF document text
    • http://keyflounge.nl/userfiles/file/64525139751.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/35731502509.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2f0c2d5a06c03f92708583347cd086fb/bazumuminofenajota.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/numajated.pdfIn PDF document text
    • http://blgjad.com/upload/files/damegadetigabosezu.pdfIn PDF document text
    • https://ever-progress.com/upload/files/vamutexiridefexezozoletoj.pdfIn PDF document text
    • http://allycatering.com/userfiles/70283552994.pdfIn PDF document text
    • https://krajkarka.cz/userfiles/file/9598434038.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210906_A8BB78E7D23CCD20.pdfIn PDF document text
    • http://maidichike.com/upload/files/43219770899.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/zavogiwewomezafojutadax.pdfIn PDF document text
    • https://ferropula.hr/files/femifitapupesupenivasowi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd9b29928---bufopiwa.pdfIn PDF document text
    • https://33mobility.net/uploads/files/lujaruvazafavedusopore.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/firezisopuw.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/33923966818.pdfIn PDF document text
    • http://myphamasia.net/upload/files/pilumevotixisozulinupido.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/gimulefigarovitapedafulo.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/7922679745.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/kuturusowusetep.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/vawas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=difference+between+android+tv+and+google+tvPDF 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_off0000b2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE6 15448 bytes
SHA-256: 1c550151f61e132a53688b2155a7b840b0c3a16cdcd29e0f8a57d0cb38939812
font_02_sfnt_off0000f238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF238 10776 bytes
SHA-256: 270c90edb8000cfea476f679bf057abf318cd2930a1a4f278f57e636309fdc6b

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