Malicious PDF — malware analysis report

Static analysis result for SHA-256 d357923fe64920cf…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 05:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c29473ef4994125aaeba2d30d8f15fe2 SHA-1: 2e7e02949021d3589e933d5013f5c866eb20dc6c SHA-256: d357923fe64920cf83a278ddd815f14f10be2dbee713c737213575920f18b0cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

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://irlanc.ru/uplcv?utm_term=android+tablet+as+second+display PDF link annotation
    • https://elesud.it/img_pagine/file/fovudu.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/mugupudibiviva.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/sikukewokosilud.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/50561765869.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce3a9c8b96---nisewabodameg.pdfIn PDF document text
    • http://receptlap.hu/files/temujan.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/veledivivudujosesejiw.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bevuxinameparemu.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614204f0b51ef---65304105777.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1d9d81dc0---16916998887.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/88969990830.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/66550721083.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/73610734989.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/sizeru.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/xorasureruwopu.pdfIn PDF document text
    • http://offerparts.com/upload/files/49955477119.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/dixetemo.pdfIn PDF document text
    • http://gugugroup.com/userfiles/konudifuduwewixovasu.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/gubalofe.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/rikiwikemexexex.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/pimebizorusegagaperajusas.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/28747582276.pdfIn PDF document text
    • http://grupophi.es/uploads/files/76099620029.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_off0000d573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 17860 bytes
SHA-256: 7ee2f185c33994b03d61ab5ed47b62ceeb83828f871f5d8271a14d7ed473a617
font_01_sfnt_off000103a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 10740 bytes
SHA-256: 1547348371ffcb6b2a110b5c349d1c766da8f9dc7bda97edf5da11da1f5cf1e6
font_02_sfnt_off00011c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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