Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2948c76e428b46…

MALICIOUS

PDF

76.9 KB Created: 2021-09-15 17:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aea64dcfcf41bae32ba673c992e7ebe7 SHA-1: e3f10173f3a5b2d7f439fcf5cb8fa036774f4baf SHA-256: 1a2948c76e428b46a69ba4dfda6c27e649c447684815860f60c9fa2015fb283d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://infrive.ru/uplcv?utm_term=rounded+layout+android PDF link annotation
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/temilepezijovelod.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/49969358872.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/buvuwanumireligujagademab.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/fufuvegafamadibujuza.pdfIn PDF document text
    • https://chineseclothingonline.com/File/webomobuvali.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/94786745460.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/sanir.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/filokinofizalonudanugepot.pdfIn PDF document text
    • http://chikatere.com/Upload/files/zidoladeni.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/vusavibikugewiv.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/24392301319.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/fitifedefixadopuz.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/97861766883.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/ronapid.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/44460144963.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/gutiladiniwojasiw.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/waduvatasuden.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/xuzipamisoje.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090600003673499.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/89538468476.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/jilogegutitisiwibam.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/fusozukaf.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/nevafepuli.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/jenodoposi.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_off0000c8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C6 17696 bytes
SHA-256: 089eb42a59620dee4faa46c4807f248180bdb8b355a1d67ae48f1c07b78671d1
font_01_sfnt_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 10332 bytes
SHA-256: e99ff8282173772cfd9aea4c1813b466b2bde0c5784806f0031e5a862ee5cb0d
font_02_sfnt_off00010e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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