Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a7c6f797e8aa62…

MALICIOUS

PDF

80.6 KB Created: 2021-09-22 17:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9408395af1cadbdf084f50ac45f9ee92 SHA-1: 556d728e46e3d8cc8d82274e2f0ddc56ceac3cef SHA-256: 35a7c6f797e8aa62925a3af167f6821a63efa82fb7a8e6d8683735871af5ad3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of hosting many links on disposable domains, further supporting a malicious intent to redirect users. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=gun+shooting+games PDF link annotation
    • https://novahealthclinic.ca/userfiles/file/28904022038.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/mamubamigovazorawa.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/tuzaw.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/56776577030.pdfIn PDF document text
    • http://santabruna.cl/upload/file/30517179324.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/26349814109.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/16236740882.pdfIn PDF document text
    • https://synersys.fr/contenu/file/47920914602.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/69864786353.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/31291672540.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/80514255433.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146022460909---jokewurabotatovowituk.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10100623213.pdfIn PDF document text
    • http://ternovykh.ru/content/file/17519196049.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/jusudubopedasix.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/82978867602.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/sewudusosulalagoxu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a94cdda0---29210029546.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/bilunejowekeviri.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/xirafepusowidabob.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/19135112663.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/38679913255.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/13297276543.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_off0000d877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 10548 bytes
SHA-256: 450953d87310b5faebc6b4a9beff63337fe6a15e279b38b26570fc7e6438fa94
font_02_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 17384 bytes
SHA-256: 227b690d1a0e8965ac824d4ab7b98d31235abf72eeae4a4edfed0b92dbb937b7

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