Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3adc82b17d39dec…

MALICIOUS

PDF

87.9 KB Created: 2021-09-12 08:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 6feeaff00d13c4d8655ce022bc457d83 SHA-1: 8f8bbda1ce8e3e2dd315907b8c0be9f6d8d7a910 SHA-256: c3adc82b17d39dec38e3a13ccd4ff0c5bf4c08d99f6cddc54ca5e6b6fa79db39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///redusiraripe.pdf In PDF document text
    • http://konferencii.org/web/uploads/assets/file/90702538204.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/sujurafipes.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/dasarunafile.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210911101111.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b02d791e62---90746888561.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/koduwufopilorovejeguru.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/kufojekumufedimok.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/welojepavero.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210901_213145.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/69979534136.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/95633119673.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/gexuwitafodoto.pdfIn PDF document text
    • https://mcsfood.com/images/file/34024326585.pdfIn PDF document text
    • https://12shio2.com/contents/files/93845635732.pdfIn PDF document text
    • http://health-bridge.in/upload/file/72732839695.pdfIn PDF document text
    • http://tzsunup.com/upload/51964192548.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/xufin.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/20933470961.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/duxoselobibasubipodijegub.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/62072897742.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/bojosonopesepejadev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=american+pie+gomoviesPDF 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_off0000ed00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10512 20340 bytes
SHA-256: 6e3e830edacfcce7fe27d3b8c80fe74922cf2555f121262aa3e8ce00363bb5d1
font_02_sfnt_off00013a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A19 10620 bytes
SHA-256: b55e0df3110c304aa2372eb001d3045c7b6def50ebefee90e0403a613db9db59

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