Malicious PDF — malware analysis report

Static analysis result for SHA-256 9336b4a8133f71e8…

MALICIOUS

PDF

83.2 KB Created: 2021-10-08 22:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: c65a80dbbe59044fa999dbd3c07731f8 SHA-1: bc368049cb0fcedaabec097a5a96af48b1f01e52 SHA-256: 9336b4a8133f71e8a799be33f504927da3ea09a9eb034791d66a191dd3b38a9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically using a UTM term redirector, suggesting a phishing or spam campaign. The PDF structure and embedded links point towards an attempt to direct users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://chcial.ru/uplcv?utm_term=net+ionic+equation+for+sodium+carbonate+and+hydrochloric+acid PDF link annotation
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28144156523.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/jodetexebizusisitepejaxi.pdfIn PDF document text
    • http://naso10.com/userData/board/file/4779434599.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/xuzutudimukibegug.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/gagarawon.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/c9fc4b9216d0646151403d9ba936267f/67877757319.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/91518875069.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/94885967604.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/dizusupamuzow.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/62407668594.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/62054170886.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/5894442512.pdfIn PDF document text
    • http://marketingnews.fr/images/file/55849358291.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210908034614.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/7oofj1e59hd2ga9nta2187lir3/77710950796.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/11724948489.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/91215102565.pdfIn PDF document text
    • http://pi-consulting.ch/download/94376966200.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/rovadogezenuwi.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/sowaxifitofisimoborul.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/75422134982.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/12885263998.pdfIn PDF document text
    • http://104408017.linker.tw/files/vajebo.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/wimibudawotifafa.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_off0000d83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83E 11216 bytes
SHA-256: 02ccd6566c4eaa6da82ced3ff313a05a73c6bd6bfc1687e33b63ca6fff9622e7
font_01_sfnt_off0000f227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF227 20112 bytes
SHA-256: 96e7b229899aa69c746c50366c8806ac4911266fdf09985e37e22b2c05ea2944
font_02_sfnt_off000126b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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