Malicious PDF — malware analysis report

Static analysis result for SHA-256 da02a3890a5cd9f2…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 17:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d2254dccc3ed88a9388bbfcb60b69d5 SHA-1: 72b07bc3ea5ddf4f2cbd78f8cda1218b1d067fb6 SHA-256: da02a3890a5cd9f22c33d871db68e9b62b4a60734fe2e220e1a793af1b5f2f8e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, 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 redirecting users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://danangsculpture.com/uploads/image/files/rijumopodi.pdf In PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/965635231201630720157.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/bijoroxaz.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428ac818e8b---10583149937.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131434551f61---55716314851.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/73379907907.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/tuwudovezakiguxuganegako.pdfIn PDF document text
    • http://gnox.vn/upload/files/7105185518.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/sanupapesogaram.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/jofab.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/44902214851.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/43009041357.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/35875820527.pdfIn PDF document text
    • http://tochalco.com/uploads/files/wososuv.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/67531096725.pdfIn PDF document text
    • http://attlas.center/userfiles/file/jivuxafedodefakosasato.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/rowiwi.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/somudemov.pdfIn PDF document text
    • https://phr4u.com/files/65146016329.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210908230930.pdfIn PDF document text
    • http://agrion.org/upload/fichier/zogajirenaxa.pdfIn PDF document text
    • http://blgjad.com/upload/files/74499850704.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/xafavedonejijodiwivotifeb.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/33718504063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=traductor+de+google+para+androidPDF link annotation
    • 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_off0000da07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 19408 bytes
SHA-256: aadd9df7baf794c955bc3f8a1ea04cf6014600ecb6f384f353e50420e3fc9cec
font_01_sfnt_off00010bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 10584 bytes
SHA-256: eb82fbd3bfac28acde2814f76dca51d7604e86de9116556c31197b96af42c9b8
font_02_sfnt_off000123c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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