Malicious PDF — malware analysis report

Static analysis result for SHA-256 071642257d2f90f7…

MALICIOUS

PDF

91.2 KB Created: 2021-09-23 19:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 059e346d301754fc9528549532f75911 SHA-1: 67ed85d48c12e1654c09d6e95c03632e6208b28c SHA-256: 071642257d2f90f70c9f142e9569f6d08e9126b2f530eb4e0a4c1188b6992c6c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The PDF is also identified as a link farm on disposable hosting, with numerous external URLs pointing to other PDF files. This suggests a campaign to distribute malware or engage in SEO poisoning by redirecting users through a network of sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://piqiso.ru/userfiles/file/83211540381.pdf In PDF document text
    • http://cuacuonanbinh.com/userfiles/file/gupetufaro.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e5facbf46---46494179421.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/73579444155.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/zamenazigefedidolorobos.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/36150917240.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/66986355173.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/futesopav.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/lifani.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/telibiwumuwefuwatusulawu.pdfIn PDF document text
    • https://paperland.bg/uploads/file/zepitibojitanoj.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/21234225055.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/38686584558.pdfIn PDF document text
    • https://ana-jsc.com/upload/files/rolerufokido.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/72015916000.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/46048337408.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/88301465645.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/josikorusabebi.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/8572004249.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/wixiwajubunasifirosureziw.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614950db06b77---javopefebu.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/22453777739.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/liteloxosibumexeluxuzeto.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/xuwep.pdfIn PDF document text
    • http://panteres.com/files/files/56016806698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=jailbreak+your+androidPDF 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_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 17388 bytes
SHA-256: 24050ee035669dc06102fbcf2d96056a7bbfe9873ece89748df8697ae9a5ece6
font_01_sfnt_off00012f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F55 10412 bytes
SHA-256: f10fac056342204c2c05851781b18a2d3c6a6cac4670b83c6a82b2fb88d906bd
font_02_sfnt_off000146f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1