Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cadc3bbca7b0b35…

MALICIOUS

PDF

77.4 KB Created: 2021-09-20 17:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6d57357362a467fdc8bc3fa16404f7a5 SHA-1: efa19b56f0c01688f7440dc27c8c60f2b8bbbaaa SHA-256: 4cadc3bbca7b0b353202c824d20334e690c4157ff7a02641b3d42e8e22fb663d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, indicating a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is the primary purpose. While no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate malicious intent, likely related to phishing or malware distribution via these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://taigesw.com/upload/files/patudurewixavazov.pdf In PDF document text
    • http://maybaobidinhdinh.com/upload/files/34416981528.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/43606435746.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/52109144798.pdfIn PDF document text
    • http://artio.pl/files/files/60255523370.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/botedezifurowaxukevunux.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/fekaz.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/lademuxu.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/54239591988.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/74063696090.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/fivuwumezitaberekemel.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7463f94a49fb9c81aafa2e8108f1d39c/91944987513.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/75458919072.pdfIn PDF document text
    • http://delve-cr.com/uploads/ridefenovevama.pdfIn PDF document text
    • http://apicn.net/upload/files/55938395890.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16143318da203c---devasapakeritunelojuwoda.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/povefuledate.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/xusukogepewe.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/zetuduxanuxuvosanola.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/39851850583.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/46541849928.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/77612022494.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/13766573031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=new+tab+ad+blockerPDF 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_off0000cb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4A 10296 bytes
SHA-256: be6a3e4142b35a58c2e5644483eced20aafd4f8b0d8159ef846e1bc63eae06ce
font_01_sfnt_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 18016 bytes
SHA-256: 65235d3ce9d4c86be79bc7611072d3078242fb0e4cb74c7bd9ddc84f5ebae5b3
font_02_sfnt_off00011073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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