Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27f21c786e1fa32…

MALICIOUS

PDF

87.1 KB Created: 2021-09-21 12:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3905b47001027caf0bea2762d653df07 SHA-1: a72a0abb5767cc1761cdec7e0f754cd47ed17dde SHA-256: f27f21c786e1fa32a8f8cdd995f332634bb9bb99586d66dabf57227100d855d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and a link farm structure suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, but the overall structure and heuristic firings point towards a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ketchas.ru/uplcv?utm_term=office+365+product+key+free PDF link annotation
    • http://connectcontrol.net/files/userfiles/files/64555329443.pdfIn PDF document text
    • https://ntc-container.com/upload/files/lugomexurire.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613809594f5c0---womusefuzigowurezebu.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/99216166661.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/28620361271.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/62868446490.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f52c0ef0d---91658166770.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/runimoka.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/zadabajunusifimidupowedod.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/wobin.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/girexamanepo.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/51488844863.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/99998954988.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/wowizovajavikevomanemofud.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/zitotavakoborifebategoxis.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/zojesuxabokina.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/63831304038.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/51824370699.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/wekulorazazuxibi.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/38407238529.pdfIn PDF document text
    • https://edarky.net/data/file/bakabipuzalip.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_off0000ed3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 10940 bytes
SHA-256: eea0ec8db55803140c5570b283cd1b36ec16769a8f5239eb62c6babd43ebb615
font_01_sfnt_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 18476 bytes
SHA-256: 08dbcfba9da30776917a81fd1cea270a4ab405523d3898415a674195b01e91c1
font_02_sfnt_off000136f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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