Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcdf4b5059cbac75…

MALICIOUS

PDF

87.7 KB Created: 2021-09-11 12:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac8f7c042448b58d9b0af511e6b65fb4 SHA-1: e1e0b3c9e8ee7ac08e89498f2ab07d5ca7e54b58 SHA-256: bcdf4b5059cbac7535bfce9558792d3c97b176d85e8af8a70f36d239f4af6f91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to external PDF files, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the conclusion that this document is designed to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://huntic.ru/uplcv?utm_term=pros+and+cons+ios+vs+android PDF link annotation
    • http://brixtontaxi.com/survey/userfiles/files/sonepapave.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/lq1bac5hsfdkkni1u5n6ug76ms/84365627895.pdfIn PDF document text
    • http://metall-press.ru/files/49168990210.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210905084920064.pdfIn PDF document text
    • https://faceless.me/userfiles/files/zoluret.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/foredotas.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109031030318942.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613429d4c0558.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/86104680253.pdfIn PDF document text
    • https://bliznacite.com/files/59514957009.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/basarelepoveka.pdfIn PDF document text
    • http://cochemical.com/upload/files/kanopo.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/65287165269.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/76816891477.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/jijexipuwilepoxozinikoge.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/68278041015.pdfIn PDF document text
    • http://bwc.lt/i/35621028476.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/30519527819.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/ziroxoliwekononiwiroz.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210911_E5934D88B34F50A2.pdfIn PDF document text
    • http://berbun.com/user_img/file/37234277689.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/98188934015.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_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5F 10156 bytes
SHA-256: 3a02d0849bec166d6acc14e00e78472cd3dc6c5bd9d319e8d63920fc3f4996d0
font_02_sfnt_off00012334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12334 17676 bytes
SHA-256: cf49e285c8681a5016d99d0c7152d6352630b0de3c9d5f9eb91974b24a5603e3

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