Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26f79dfbe939fc0…

MALICIOUS

PDF

76.1 KB Created: 2021-09-20 22:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c7c1034242e12e26823b7c28d7a14f1 SHA-1: f9492883ed6279948b1665c96ee7904bfaca618e SHA-256: d26f79dfbe939fc052d07b032418e06002a1b49ede94de7a1f12ae0eeef84dcf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable or used for hosting files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, likely to distribute malicious content or conduct phishing attacks. No scripts were extracted, but the structure suggests it's designed to lure users into clicking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=read+kml+in+r PDF link annotation
    • https://miaousland.fr/ckfinder/userfiles/files/21492393627.pdfIn PDF document text
    • http://aa-nusd.jp/99358284908.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/23181721644.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/953569913.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/67993108220.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/nimofevojijefexonoda.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/lafidejutasubelukozoxi.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b59e51e0a---pexijopemupudosixinit.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/17502941107.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/xiwuramotuwiwezo.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/50223099711.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/menofetozi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456bc73e9f6---fepajupuwezezimisinor.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/220039944.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/90451283007.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/vetiketujasekot.pdfIn PDF document text
    • http://bdnchem.com/upload/files/gutonifuxidapawiga.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/14371082906.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/71073539720.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/62325462735.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/tikugeb.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/vujubov.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/vizagikefofani.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/rafebepasiranafefodid.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/71267863980.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_off0000c4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F3 10160 bytes
SHA-256: 301c45bd8ce5e4167ee841875b3cb333c89850771f34a20323da308de57b00e8
font_01_sfnt_off0000db7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 18172 bytes
SHA-256: ea2436ddd4906ccc08d57add3db7d77154fac9eb505400d12b80e58f9be61032