Malicious PDF — malware analysis report

Static analysis result for SHA-256 1635b841dc396dd0…

MALICIOUS

PDF

74.7 KB Created: 2021-09-15 12:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 524d6354b2d51e72b1d2bb09894ec36a SHA-1: d7eb76d04250ac83cce38c03a4d5f4524653a2b0 SHA-256: 1635b841dc396dd02ee996bdfdc012432707e5176bec431db12dd260fb678e15
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains a large number of embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=efootball+pes+2021+mod+apk PDF link annotation
    • http://dija.lv/public/userfiles/file/629825991.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/33830701557.pdfIn PDF document text
    • http://teraval.cz/res/file/birevebadulurixatuzelak.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59378946350.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/verababupavux.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210904040939.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/gizelijudavoxaw.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7a797ab49---59709118973.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/3095842122.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/fixila.pdfIn PDF document text
    • http://parentini.it/userfiles/files/35968680030.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/97469757109.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/pabigug.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/13337776195.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/66533233771.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/surumi.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/27687895434.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/bepatibipegawudexewagudi.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/gebiwagebulugifu.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/8353515934.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/zepifosifukemoz.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/dimukuvajez.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/savuzidunonogefefa.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417be666d27---bafove.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_off0000bde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FE 10872 bytes
SHA-256: 46f039add0c3723e07e8949d9e64056fbba69bccbb948b13a5bfef09b311f40c
font_02_sfnt_off0000ef06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 17668 bytes
SHA-256: f4d477208d95e5d245d1b338ead35d849a631440e0d4f3c606431e055faefa2b

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