Malicious PDF — malware analysis report

Static analysis result for SHA-256 523f9a749947d068…

MALICIOUS

PDF

70.2 KB Created: 2021-09-10 13:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a6aaebddcfb315ffaf0da19ad855138 SHA-1: 8cb990d8ebca1820cb10a0232e2a7169a681eb43 SHA-256: 523f9a749947d0682dd1a4819d3cd2fe0f7941029013f049bc0f1fc3dc076ad8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body, though heavily obfuscated, suggests it is generated by wkhtmltopdf and contains numerous embedded URLs, many of which are part of a link farm for cracked software. This indicates a lure to trick users into downloading malware. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ourpreferred.com/userfiles/files/28997939095.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/60643521888.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/8477445151.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/tategesoliferonuf.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/lotizarefavisosebezonatap.pdfIn PDF document text
    • https://trexanh.net/upload/files/70699521354.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/vemaxukunivirilosiw.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161397aee0d989---gowatuwaliropadevazet.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/57932780421.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/tuvijotolirovedotoleb.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/bivavifu.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/javub.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/10566465236.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/pajotefubasoziga.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/95485783908.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/78452006537.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/doxazep.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/kiwijemilajegirak.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/jinukinoxi.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/99950131617.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/lizafibizegofeb.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/wiletupanizukunilixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=traktor+2+crack+macPDF 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_off0000b4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B7 15740 bytes
SHA-256: 10bea4ca65b618b2dc44f87dd12233e43882ba4b03edacd224261467b0815557
font_01_sfnt_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 10024 bytes
SHA-256: 5adfcb59c4119cd65c4701da59af2346e96020584123003c171f13920f0f0570

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