Malicious PDF — malware analysis report

Static analysis result for SHA-256 966b729940a5522d…

MALICIOUS

PDF

78.8 KB Created: 2021-10-07 13:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7198bea257f81c15765ca87c1900a18d SHA-1: 7586cdc5d020f4b066523b58b27263808bf224e1 SHA-256: 966b729940a5522d56c103391a518a6a2dad1b7feed747aadf774c17704927ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://radecznica.pl/userfiles/file/28887298616.pdf In PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/47798110849.pdfIn PDF document text
    • https://plasterglasgow.com/fwd_docs/file/gexizipixugixunenobesilur.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/19462127814.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87425486623.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/34543970659.pdfIn PDF document text
    • https://andrejc.si/files/file/pefopadiramisidasuxe.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/17346944454.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/52294880062.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/58083052728.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/8564248892.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/pebogetavi.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/delerasow.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/90208129596.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/pigezubomudigomisinonewox.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/29100556623.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/jewokegadetoruja.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/dezokilo.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/gamogu.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16152c86621d36---jogukabi.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/65308505894.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/zirowerusego.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/rokinikuvuzelobamim.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/94626745322.pdfIn PDF document text
    • http://pololanna.com/user_img/files/71432449345.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/kujavuxaxuxadixetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=you+have+a+match+emma+lord+pdfPDF 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_off0000ca33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA33 19084 bytes
SHA-256: 4bcfe3d61e6dc595fa3d994d3e4cb6c8c8bc3e18741891706791e96e7974d91c
font_01_sfnt_off0000fc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001148a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148A 10668 bytes
SHA-256: d4d96cb466c32d2cac269d78717bfe2ec357531a4698de39ff83f815ff6f737a