Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc5f588698913df…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 01:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e905cf8395bf69e2c22a48a499703509 SHA-1: b6903685b5d3feefe259c92eda764eaab32a579c SHA-256: 7bc5f588698913dfccc6ce4557f963b9babbb81297746d8064b3c62876245259
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://inwebjor.ru/uplcv?utm_term=best+quality+video+call+app+android PDF link annotation
    • http://ajeah-intl.org/fck_image/file/44551023375.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210914_BC17E7EB144F0AAE.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/97749812634.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/fadifak.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/wakazowodexurozupufe.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b49e6c6d46---8945223843.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/jikojijuzizapagakanalu.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/3997884427.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/mubesugemupavoluwofekek.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210904012700.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/75543609509.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/49071753508.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/ropebekalatupev.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zegesewuwiwozegedovenulir.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/33367921216.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/67183600347.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/64145052442.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/56198968117.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e7026def5a1c6bbe69714cb1515a4140/80734007822.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/bitopebagijulum.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/93254841487.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_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 10984 bytes
SHA-256: 813edbe2b2465dc1c0b6454a93a5a01dcd6085d7f8559a48a0b7ca32f9c02810
font_01_sfnt_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 17740 bytes
SHA-256: 67f5b18c47a3e1e2c07b43d610371cf9dab1a45ccdee300cb8aed0ebbd0e433b
font_02_sfnt_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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