Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd22ab93617fde74…

MALICIOUS

PDF

86.9 KB Created: 2021-10-07 12:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 8af4663646f69a6f39c56ef52b5a0698 SHA-1: 176922323c8e00725650ca8c7bc8384be51d11bf SHA-256: bd22ab93617fde74163f64ebf1ba1637691b0839b4911c35e8fb8e9cf53d9b99
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 phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or conduct phishing. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://creative-format.com/upload/editor/files/kegusilowijebixomo.pdf In PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/2534658723.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/sepenad.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/lazibopegamonagabalamam.pdfIn PDF document text
    • https://bem-sa.com/img/file/wanalejokuzewibevo.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/wirumukoxutixiputedis.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16158d99cef8ef---48986418257.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/sinisepavopabadupuxif.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/32391115100.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210916_011758.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/61147040465.pdfIn PDF document text
    • https://network-italia.it/file/65089527284.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/1974845396.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/14598908381.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20211001_745C232649F955BE.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/sapobisewumodupifapix.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/92555102568.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/tugafixifesi.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/39219146466.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4bc0cb0071587fe2514a96f1e2181756/guwawejixarafeno.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/54867680311.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/madagafaxijuref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dhl+express+leveringPDF 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_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 10320 bytes
SHA-256: e03efa7a050d7f68c1db94b1d9c05f0204c1f8bc808f8befb27a6bc816b08b3e
font_01_sfnt_off0000fecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECC 21480 bytes
SHA-256: 108a9f03c3cc2bd740bf08eb1c216213749fec0138c89884ccee66f6c542b331
font_02_sfnt_off000135fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1