Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33e291261a76c2a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-23 19:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 43653e7a01da60b0e92c84a310f2f6b2 SHA-1: ea6490a96b9abd788c0a875e15f5a93b5015a8dd SHA-256: e33e291261a76c2a419cc5522f59609024ef2b83a0d44cd5f5669091f507df48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=iphone+12+unofficial+price+in+bangladesh PDF link annotation
    • http://nyett.hk/uploads/news/files/nafejevi.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/78966413948.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/03rc5d9vu8dgftkb7l020dea47/91488331547.pdfIn PDF document text
    • https://bczenekar.hu/files/file/paxerelenepivurenuz.pdfIn PDF document text
    • https://www.iimranchi.ac.in/ckfinder/uploads/userfiles/files/17615064782.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/geperaburokun.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/26407621880.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/29781508579.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/55971586260.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/2084425843613c36d38567a.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/53722435605.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/tubokexekebumogeze.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/jobija.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/rofabulubeluguziw.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/baten.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/fuzijebafajit.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/bawezoronexu.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/20895306815.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/dudozijagerovelofadasi.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/26505793604.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/76471728337.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109220209236638.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_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 11164 bytes
SHA-256: ebdb04e807bb5e780af95552160ef27ed42ddd2304ae32e3fd0426e264ec2d28
font_01_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 20804 bytes
SHA-256: 43827ba50bcb0f0a17d54f7e4896fe3db0d25ca95f84a1314195c3232af7c51d

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