Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6ef3bb1dbe9b51…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 08:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35c7e537424730cef54b181f62fd09ae SHA-1: b05ce1e62914ca3e2e18f1fb6a73c2cd53457abf SHA-256: bc6ef3bb1dbe9b51988dbeefeaa57138f378fd8a35f7edf6fc4344a1bc750bd6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior. No scripts were extracted, but the presence of external URIs suggests the document's primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=granny+and+grandpa+apk PDF link annotation
    • https://actionsporting.com/userfiles/files/nakezogurivome.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/29483646848.pdfIn PDF document text
    • http://prestopc.it/upload/file/gipugixawipix.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/jofixutesijul.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/91077852522.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/57812917391.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/valev.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613826be0ba1d---kumorufowed.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090804270792.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/780369119.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/31757935295.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/govuzawa.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/fajabavojogojatejaz.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613d00b997432---neterena.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/87768335919.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/dapebon.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/patoserikiwakugegimovowux.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/86738399445.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/24786098650.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/fodiziniz.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/30928667160.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/gixusiwovefa.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/52689415338.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/40386708086.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_off0000c05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05A 10156 bytes
SHA-256: a7295817c000499380f8907f84b0ceeaf64cd549cb367fd79b76924949c696dd
font_01_sfnt_off0000d6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 16820 bytes
SHA-256: 729a2338b5b35f362369361266091e434a44139033c8eea653d0542776784c6b

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