Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad35e0c13e67f047…

MALICIOUS

PDF

80.0 KB Created: 2021-09-11 22:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d8a2ff166a612ebfe4e5989e911877c SHA-1: ffa4772dbc9c61cb4f1e4f80e6dc49a371cf1897 SHA-256: ad35e0c13e67f047cde71556a406a646249a2d48025d71782dad73ffcf8eeb2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on disposable domains, indicating a link farm designed to obscure the ultimate malicious destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM strongly suggests this is a tactic to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://markaz-e-durood.com/EditorImages/file/96991915085.pdf In PDF document text
    • http://airfa.it/userfiles/file/24813111466.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/90908940156.pdfIn PDF document text
    • http://qdjshg.com/files/file/89306736213.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/jowurijebofekila.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/sufogubejunida.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/11185338895.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/43218350826.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/jubapetedipogulo.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/66793613038.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/vozukitita.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/64129486470.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/zerotokaxefodopebixo.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/pisikiwupile.pdfIn PDF document text
    • http://stevis.cz/files/file/1971393194.pdfIn PDF document text
    • https://partnermind.cz/images/files/rululepikavusabozatisor.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/14173621146.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/votufebezisimulule.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161338cf62d212---mebuvasobeso.pdfIn PDF document text
    • http://samtekelektrik.com/files/madutuz.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/rokipujusewisokopu.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/56547382582.pdfIn PDF document text
    • http://c-amc.com/upload/files/kenep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+find+your+android+phone+ip+addressPDF 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_off0000d72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72F 10840 bytes
SHA-256: 0b6c8552948c88b89cf610b584922f0a8fa3ea03f07b2d6f594df6367b6fe8c5
font_01_sfnt_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 16248 bytes
SHA-256: 78c975e8eef7ab1187fa1d8cd5199317382593073625156c8ad523fcd6548ec1

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