Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47ad87b4c781de7…

MALICIOUS

PDF

71.7 KB Created: 2021-09-17 13:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7c303e550eca2b04e1cc6714b89d3ba SHA-1: 9732a530761d60c1af491085bdd478967017879a SHA-256: c47ad87b4c781de71e13be99f85b7d131b7f468e5d88ccc27d3c89d1824858b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and external URI firings point towards a malicious document, likely delivered as a spearphishing attachment, designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=index+of+martin+tv+series PDF link annotation
    • http://tg-focus.ru/userfiles/files/dewukuxemakadol.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/powigezabuxad.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/tezajug.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/kozazozuwedu.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/19833235719.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/fulomazutevezuxegume.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/bokuwirujedol.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/romemibepujubeledutaloba.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210912085821.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/79144652662.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/9418201095.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/72366859228.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/tijatok.pdfIn PDF document text
    • https://irrisyst.eu/files/file/4069458265.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/18578729689.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/xekan.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/43122775901.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/nedajekive.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/waxoxirofi.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/89318200503.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/56309314424.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/25388887763.pdfIn PDF document text
    • http://gibisch.info/files/files/zozewubaviz.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_off0000b751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB751 16424 bytes
SHA-256: 1bc46388ad8c20439cdd5b008be105e0b66cd5afc5812354e1438cf9ae279670
font_01_sfnt_off0000e0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 10588 bytes
SHA-256: 220f7b8c18b01c5fc6b84fca6764b848727449b3c4e14e0516ae5121f8929c73

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