Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0a0a7b2a29a268…

MALICIOUS

PDF

85.2 KB Created: 2021-09-14 01:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 76ff4932e221c9fa17e5775fcb26bf5f SHA-1: 3485c4d9259530a745cdd3be0449ad2e28ad7c3e SHA-256: 5d0a0a7b2a29a268dd42d0b29b16e3366e69bb2830998c5efc0c61e5f5a814bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://bibrka-school.org.ua/ckfinder/userfiles/files/vetefuwetomopapidilowani.pdf In PDF document text
    • http://bwlpsalisbury.com/uploads/files/tavasosibufatokanedoke.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/48322509158.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/zaselavu.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/84703720633.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/memunegijejobute.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/xiwukemojugisekifabebaxad.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/30096485051.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/63292258997.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/24703677345.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/xekaxeromedozazodafori.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/80525065789.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/mesikebabesoxiz.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/88266654221.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/wigonobuleboduxekikisizem.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebe58cf41b---97590402686.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/nitulelevavufowilunixi.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa9304e54f---7153133005.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/petolidonimodudeluzuk.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/segoputevijom.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/wokevu.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/vetogazisufimezosuvadose.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/jixopazizolifo.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/jobugolatifazedizod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+tablet+as+windows+monitorPDF 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_off0000e750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 18212 bytes
SHA-256: 03cb6cbbfc1f20f578c006e15ed9c6a7303e29e2c668bd5b54e568e161e081a9
font_01_sfnt_off000116a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBA 10616 bytes
SHA-256: a4e9f07ac444c2628c80a323deab5acca43ebb0f9e2e1d4e6f55e58149f37a27