Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd747668d172f8d…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 06:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 14014976a8be2cb7fa52da33e1c22005 SHA-1: 2cdf1429ecf1b208ec7cc2d5a7a43d26e9bbf854 SHA-256: efd747668d172f8d1871e32999e573f6e69b341da6bdea2f1264ebce44007fe8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF's structure and the presence of external URIs indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://a1-automotivegroup.com/upload/files/xadokobuvojogiwuranapod.pdf In PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/lunomusunowikeruxogufade.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/wimowiwaluduwunokaketisul.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fff5ea9c45---18232753143.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/sexoverajizilupinaxerola.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/37714965261.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/57629795654.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/tetarepusogibixasol.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/zumiluvurivapinipupa.pdfIn PDF document text
    • https://matricula.arendic.cl/files/12157115501.pdfIn PDF document text
    • http://tencanpowder.com/d/files/59052758231.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/rojolebaxidozokarumab.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/19951969900.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/wozuleduwubarirarujog.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d87c955366adbe4a2eb50c827656b6b3/liweketaxopajusedotixofi.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/22937782763.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/93033558721.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/68108511745.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/59621320221.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/dapuvixurizewuriw.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/4062208007.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/lelijidawunosa.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/luvosuvonalusabuxifuva.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/96789812581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=date+a+live+watch+onlinePDF 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_off0000ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 10212 bytes
SHA-256: 07779f429f174ff9685ed8b3e18b528450137a842d10acd759dc071bf6b74888
font_01_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCB 18640 bytes
SHA-256: f7125e51eea8f1cfac3436fec20bff80d649bbb6f7f0e0788e8fc28cf972789c