Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8d9e9761befc16…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 19:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1cad16c2747eef92cb5d940c223668c6 SHA-1: fa8b346c874d57261d76b117f4364d6e2c220bf8 SHA-256: 7c8d9e9761befc164a6736a06a4ffa20f785cba95777aab30a2504ee7433131a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document is designed to redirect users to potentially harmful websites. The document body content is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nomylo.ru/uplcv?utm_term=windows+7+ultimate+32+bit+torrentz2 PDF link annotation
    • http://xy-interior.com/uploads/files/202109101848066947.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/zojugagulab.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/xidavamidu.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/genulozixujatip.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/83033967198.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/82539958740.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/malomazodurizagofi.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/92077937468.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/70454790315.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/somegolukinibo.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613f78fb0af00---dukepigepixosow.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/34668888544.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/bilixowira.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/43498797368.pdfIn PDF document text
    • https://theipbuzz.com/images/file/24035442231.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/42692789023.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/3776738228.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/86676457379.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/62476179945.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/siveferukako.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/vexokatitil.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/wagagidavenukikijiboluf.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_off0000d8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B0 17892 bytes
SHA-256: 6d9e0f842035b8583c0aba8a700a9cf294a9761164a0423589508b144e8972e1
font_01_sfnt_off00010750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10750 11128 bytes
SHA-256: 181db0b20d3bb3e950043a64136cced651a5c95e5850451331b0d9cc461dd287
font_02_sfnt_off0001217b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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