Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a438f1116027ac…

MALICIOUS

PDF

76.0 KB Created: 2021-09-24 17:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b02ab0b7e4c97a67468fdaf303d6d3e9 SHA-1: 54577dcdbfaa4007746294a94b3ebc7db1b3f5de SHA-256: c3a438f1116027ac3df7e2266a3379794426507323ba8182f723b178c09854a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially malicious content or phishing sites. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=juegos+para+emulador+de+gameboy+advance+android PDF link annotation
    • https://vietnaminsight.biz/ckfinder/userfiles/files/27202367487.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210918233829.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/20206047017.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lijekegilasapolekifex.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/24880981163.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/99872408503.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/disenavikuzorolurexu.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/32469451675.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/44971855815.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/32508154119.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/68285249031.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161364c02b3473---pemara.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210915215947.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/52623993197.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/77918314177.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/zazujesavam.pdfIn PDF document text
    • https://superchills.com/userfiles/file/31287074515.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/ce36751f0d1f67bfc9e7378c6ef6b0b7/sagelofen.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_off0000b90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90E 11172 bytes
SHA-256: 28681f53e9469ee62c97fae2ec9dabadd876ddabf199a60d41dbcf8b01393707
font_01_sfnt_off0000d2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 21664 bytes
SHA-256: 76d267d7d5c2a537738e68af8bea4d8c8533ed95fa90018172ddd9285fa2bb40

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