Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a63d6330e97250f…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 09:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 275f6114181efb50f4bd3e94c031a0db SHA-1: ae4356ed00a5cc4164136bfacf8167bc9d7fe330 SHA-256: 3a63d6330e97250f003211372c3f2f33e2c761a17bedd5fe32c563a0c8da7a45
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, indicating a link farm likely used for SEO poisoning or distributing further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://8njl.com/userfiles/files/bavezoluseziruwuborojog.pdf
    • http://kalikraft.com/images/file/wekoguzemenoduduveb.pdf
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/jasamelowakorepopimus.pdf
    • https://omprintandpack.com/userfiles/file/rawezubabimu.pdf
    • http://beming.com/ressource/site-image/files/pituladotazu.pdf
    • http://francescofesta.it/userfiles/files/kipasibimu.pdf
    • https://nesselaarbestratingen.nl/plaatjes/file/76548606331.pdf
    • https://bank-kredit.at/ckfinder/userfiles/files/8942384640.pdf
    • https://moulindelarroque.com/userfiles/file/73397315932.pdf
    • https://greenline.bg/userfiles/file/sebopebizigel.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa1d179d77---funobasomigitesun.pdf
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/mogafelokozatom.pdf
    • http://grandinhr.eu/images/user/file/zemoneluvitororasu.pdf
    • https://martabaktelor.com/contents/files/ximifipizotowawete.pdf
    • http://b-solutions.net/userfiles/file/tibekawivajiv.pdf
    • http://oxigensupplies.com/shipinc/userfiles/files/85434174852.pdf
    • https://irastuff.com/admin/ckfinder/uploads/files/87878758423.pdf
    • http://travelci.ru/ckfinder/userfiles/files/22747100108.pdf
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/13905912366.pdf
    • http://webminmax.com/userfiles/file/legokokexesakir.pdf
    • http://littlepearlspublishing.in/data/eimages/file/79619725525.pdf
    • https://wintechindia.in/ckfinder/userfiles/files/bufofoko.pdf
    • http://jongauger.com/userfiles/file/zufefazinuxolej.pdf
    • https://myarchitect.es/ckfinder/userfiles/files/72056717397.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=windows+10+pc+emulator+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b031.bin
feb3a857a674b92cac333cca0ebcf948e3b04dad69ecb8b7326fac99ca866cc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB031 11132 bytes
font_01_sfnt_off0000ca36.bin
8dc7d5c14d4be7943cab69a785f617a4f5171e58450af77ff643406bdfddf3d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA36 15644 bytes
font_02_sfnt_off0000f194.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 16792 bytes

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