Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ac85ca9071eb16…

MALICIOUS

PDF

81.8 KB Created: 2021-10-14 04:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3328731bb7c157d8b1f34442258a3057 SHA-1: 4af1e5286600f7e150e160dad743080b6633c517 SHA-256: 08ac85ca9071eb1677ef5603998759b7e9ec629aef7620b4947eeff952c00029
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a high number of embedded links pointing to various PDF files hosted on different domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs indicate a potential for malicious redirection or content delivery.

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 https://solidpractise.com/files/userfiles/file/mipujevapetijuximijokoj.pdf In PDF document text
    • http://studiomanzetti.it/userfiles/files/39602499461.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/48084182544.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/90731301264.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/99386552840.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/duvixefowurobuwaz.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/jiliweliravapuwera.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/gagozodufoviberibomewo.pdfIn PDF document text
    • http://nyt.jp/p_images/resource_library/file/17469286166.pdfIn PDF document text
    • http://ymmicro.com/files/files/rabolizezaromomafipi.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/41191573955.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/64684187133.pdfIn PDF document text
    • http://torgoborud.org/images/file/158224147.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/gadam.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcaab6c25d---59305349856.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/11043394529.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/24492874934.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614351b3835de---32089127345.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/bagimovumebawivilu.pdfIn PDF document text
    • https://ulsantour.com/FileData/ckfinder/files/20211011_B662CC55CE8E0C54.pdfIn PDF document text
    • http://lamay.de/userfiles/file/repiragapajivuzunabife.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/70437063955.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210928_348EA2C2CB8296C8.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/oscUj7J0Gjw/uplcv?utm_term=bullet+in+the+brain+tobias+wolff+analysisPDF 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_off0000d710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD710 19088 bytes
SHA-256: 365674b090d6fab1221b2c2dba7f99ca3c306bc6b90e94e16b9a2b7007dcc487
font_01_sfnt_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 10804 bytes
SHA-256: baf98cdf1bd22d21478540afc881616d6ac9163a14ae604b3ebd1a522a5a6e6c
font_02_sfnt_off00012136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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