Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d25d92cc14de03a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 15:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84cb7d38abcfa4c5af17ba6accccfa9b SHA-1: 72d6a4db9dbe5e4ea60054b5003faf971461046a SHA-256: 9d25d92cc14de03a451cf1234dc3d77ba2b485cdbbac756a0573ad3076d1fdf5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning model and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=harry+potter+full+part PDF link annotation
    • http://keralastatetailorsassociation.com/userfiles/file/gobiranotinebolim.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/97055801028.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec1707e43d---74869172658.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/rumoduxo.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021910_111523_151.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/82879656949.pdfIn PDF document text
    • https://jagominum.com/contents/files/42820821555.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/95248282764.pdfIn PDF document text
    • https://arendic.cl/files/teregeni.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/movolumereben.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81781786100.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/xefamen.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/mukikozotari.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/najejululivanelorejuki.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/78479101658.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/pajovenosugomoro.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/75319814646.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/bakasagave.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/81419544939.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/86192571953.pdfIn PDF document text
    • http://clerus.hu/files/file/nedeza.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/79309161375.pdfIn PDF document text
    • http://yoron.net/up/files/41251818577.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210916_102B061EFBB98856.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/magumixezugobapipadi.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_off0000d980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 10192 bytes
SHA-256: a78924951efaba076ffe5b6690b53463b472c35985121012794edaa4808c7b4e
font_02_sfnt_off00010893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 17616 bytes
SHA-256: b6cf6a58418280662f45f45d3bb6e55a333797a3da93ac033e46c6141022c7b6

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