Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd70c4133093386b…

MALICIOUS

PDF

90.9 KB Created: 2021-09-22 21:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4c59de05203cd1980d2a42517707c11 SHA-1: ea6c38b26d8512586eeb36b71500065c4a471c86 SHA-256: cd70c4133093386b7b5b4fa11fdea88bb4cc789d788152dab413abf90ebb24bb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to external URLs such as https://medvor.ru/uplcv?utm_term=never+kiss+your+best+friend+season+2+watch+online+free, which is characteristic of phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://medvor.ru/uplcv?utm_term=never+kiss+your+best+friend+season+2+watch+online+free PDF link annotation
    • https://nstyapi.com/resimler/files/gakitagatovuwenutebak.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/55291983786.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/xolesire.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/radizenaxinup.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/wujurajiwoxavita.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/nedopoxujikazededi.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/51479528836.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/13903331322.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/bejigezasosodezitudivul.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/petalajozegunat.pdfIn PDF document text
    • http://dfanchem.com/upload/files/xagikukuduxedu.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/83535103986.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/zigutisaminanexixuxi.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/wokezinazujamenawosobax.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/javeg.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/36769982698.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/80124604563.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/kezesisogeviwugenugu.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/lobisuxogujirida.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/fafamazadig.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/wanamejuwaze.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/61499937868.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/17506028860.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/21986966597.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/zumuse.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/96221603367.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_off0000fa61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA61 11268 bytes
SHA-256: bb1ff8269cbd6437eef0efba2788ae30b2cfb972e3cf5b8ef320bd547ff837ca
font_01_sfnt_off000114ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EF 18420 bytes
SHA-256: 36c5e7c48795f9ca1fb1239b56aa33ccb0c819556d18ef017fa7a122d3671a4d
font_02_sfnt_off00014513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1