Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c37a15bf55cb671…

MALICIOUS

PDF

67.6 KB Created: 2021-09-17 10:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 045558f5acde6128a0a29cadd948fb82 SHA-1: 739e8e9e718196b191676fea9132558e8565f79d SHA-256: 8c37a15bf55cb671d258bc0a3a0298c2e382910c31444cc53230978b29bafff1
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host disposable links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://st-ark.it/userfiles/files/tikofumomizawajirogi.pdf In PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/soruwogijibe.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/donitalobugomejakusara.pdfIn PDF document text
    • http://canadanur.com/resimler/files/30768670746.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/29199455889.pdfIn PDF document text
    • http://cqhuaan.myhost360.cn/upload/files/09-06-17-12-46-87.pdfIn PDF document text
    • https://huanghecables.com/d/files/87676438153.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/6207461142.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/laxenokali.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/pifosaramejumawupugiforet.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/55488067796.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/ropijeporiluvopogax.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/98038489690.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141f89778450---newalobedewi.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/91788518804.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/32342904047.pdfIn PDF document text
    • https://resicolor.com/upload/files/97188833114.pdfIn PDF document text
    • http://iknow.pl/files/file/53810482714.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/pojirawotimetoxesewu.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/gapodo.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/50283566762.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd48cea37---lokadaremixaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=flash+tool+for+android+free+downloadPDF 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_off0000ad29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53B 14448 bytes
SHA-256: bf73c1cf2fb5b76e2939e762b68e19c49bdbcab5d09ee3b174a6fda78584b417
font_02_sfnt_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 10516 bytes
SHA-256: 1efff32889dbf21d96e6a4e4332de883c14309218402b089b1ffd924df83c378

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