Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ebf2d04624e44f7…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 04:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 23002cf03d448fd528ba649dcb0313af SHA-1: 921cdabdbc1537ff54bb15425e1b65ae1e4f0597 SHA-256: 9ebf2d04624e44f78c6e1a654d4d8c2a33207fe32163c01c4bf35cfaa2f81234
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or spamming operation. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=2k20+mycareer+codes PDF link annotation
    • https://cpsguffanti.com/uploads/file/wogijipubas.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/litememutak.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/sewuvoridotazaxu.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/19a9db2690447125a5fb89179e4919c9/142725085.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/87114575211.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109162320466218.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/18421464508.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tt83bh77da9fg2qg6542sla2i7/pafunez.pdfIn PDF document text
    • https://carlojans.com/cms/file/dolewumotetimugu.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/88098141001.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/mobexubafas.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/pujawunufaxej.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/45728251544.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/dalizag.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/mefil.pdfIn PDF document text
    • http://dongphat.net/upload/files/siderufesobatogenit.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/35584107917.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/zajugujemiledegudoditiber.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/85174012225.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/segapazibemume.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/29596913673.pdfIn PDF document text
    • https://blokhol.com/upload/files/91818478259.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/mawosa.pdfIn PDF document text
    • http://danbikoreansj.com/uploads/files/daligerowobakevidupofogav.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_off0000b20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20B 10544 bytes
SHA-256: 9444e3d3611236754d0f9f89b5ada18457f675c96618307458d0d0a1b0f58ca3
font_01_sfnt_off0000ca2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2E 15228 bytes
SHA-256: 53c0d48adec91c32733117de92e898eee4464aed3286d8484c8d2a214718153b
font_02_sfnt_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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