Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca5c4e44d72a2e5…

MALICIOUS

PDF

78.7 KB Created: 2021-09-09 14:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3bb614e0d8f7137bc4b16760ffe1dc37 SHA-1: ef802dbb80262a8205ff47cb79a0f8969c68b736 SHA-256: cca5c4e44d72a2e540a7aaad2bf0eb0b2bbd1ecd074b790bd283b6ccb0dda163
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It functions as a link farm with numerous external URLs, many of which are hosted on disposable domains, suggesting an attempt to distribute phishing content or malware. The PDF structure and embedded URIs indicate it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://crewmak.ru/uplcv?utm_term=ice+cream+1+mod+apk PDF link annotation
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/3klg2dpl60cqgl08a42rrf88en/13605019612.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/21554031834.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/17491407955.pdfIn PDF document text
    • https://eventaipei.com/upload/files/fesalinokegapowusivupowi.pdfIn PDF document text
    • http://hijoin.hu/editor_up/15009624454.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/86111119532.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/wilomimoderul.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/65274994711.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/xofexexapokanobalosa.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/63421739328.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5cd789182---mogipukapudepewevuda.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210901203215.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/69509334703.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/netajajogaselowomabib.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/49813938434.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/taguxefinid.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/501124249.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/kadabogoz.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/73399391266.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/9092754691.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/vawexowi.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/49379031925.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/84633894086.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/zorotemosalu.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/maruvojedixiwoliluguwek.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210909022005.pdfIn PDF document text
    • 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_off0000d0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E2 17432 bytes
SHA-256: 01c78fb0069d91b044819e432f91a0e4fa5e6a3d55562522825082c959083da3
font_01_sfnt_off0000fe27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 10260 bytes
SHA-256: ff9e92cbb5b6b49d34df3ecd7a2c2193bd8e3dc5ee9496ee0c503f9e4d69d28e