Malicious PDF — malware analysis report

Static analysis result for SHA-256 95890f24c61f260b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-22 10:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ec5d0b15b406e5e43c8f28b9a89ec88 SHA-1: 37afa74a1593ebb9d933d657004eed6f3bd92e56 SHA-256: 95890f24c61f260b0d0bdcc98f1d26ba33bdf5b2e01bd53c940301051da8f5fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content, disguised with terms like 'prince of persia computer game download'. The document body is heavily obfuscated and unreadable, suggesting it's not intended for user interaction but rather to host exploit code or redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://krisoc.ru/uplcv?utm_term=prince+of+persia+computer+game+download PDF link annotation
    • http://mikailang.net/userfiles/file/20210914144316_1254870733.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/kuberisuniteseniwukudeg.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/lakoxazanutegivotisukuziv.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/mogosub.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/49015569008.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/tajexizusulapeta.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad9237701e---69174132755.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/64291166361.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/vokokelu.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/22660374995.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/pepegupo.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/58e761a577170aa1d35e689fc56ba681/41429553889.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/taxurukuraxololeken.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/sexisotetevaxukogudelu.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/65728451948.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/67455313614.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/nuputixatafofufuwafera.pdfIn PDF document text
    • http://anindecor.pl/files/file/2455879832.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_off0000b913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12A 11152 bytes
SHA-256: eb0c79a253c75d89beac06887dd4994a256c060b621b428fa4d09ee1e32e78b2
font_02_sfnt_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 16076 bytes
SHA-256: ab301c582dd7b793ba3a889317dedf8f55ec5c0671633dc909fea37bd51d9cae

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