Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3c6a5be661b0e0…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 16:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 672a0bd3fa99debda12b6606fd7d7b0a SHA-1: b25df6f24afddf1f0ec1241e56322e4059d8c96f SHA-256: 4b3c6a5be661b0e069cb5a130ffacefca63a81334d885e0ce13a618d121900e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although 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 0.9960

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 https://philabc.ru/uplcv?utm_term=gameloop+hack+pubg PDF link annotation
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/78190686584.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/32651303718.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/rewigelowizufawaxidanojo.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/37552482907.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/849445d798a3de689a5967a0d2cd1c5e/85801365054.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/mixugar.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/levafegumawugipiwesi.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/85917942293.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/67421420923.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/rigewufubal.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/38557615432.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/jatapobolavemukufe.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/12984812380.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/vulupazewasijisevi.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/fidixakagavoz.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/nesomewolesax.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/58373975972.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/45221593681.pdfIn PDF document text
    • http://maidichike.com/upload/files/somefarefudolu.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/70939607273.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/vuxapodabotamo.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/xakafitivesikovobu.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/lopelivoka.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_off0000d039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD039 20484 bytes
SHA-256: 215ea36eb9ce16ae2d490bb89aa75685af3258a1bad0f685127828391c34cea4
font_01_sfnt_off0001061b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061B 10628 bytes
SHA-256: 67ebc243d9feae67be81b357c175f37f92eede2911de62520124e78ed31c41b8
font_02_sfnt_off00011e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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