Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a93b6ffd6c28a9a…

MALICIOUS

PDF

88.8 KB Created: 2021-09-16 17:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f5e0482161a6427615c2f28649fc0d6f SHA-1: ccad1aa1ce8b0663e24bd8047cb465820a06a5a6 SHA-256: 9a93b6ffd6c28a9a5e5c84c389bc3493c9cd7442e59bdbd5d586fe682e783bfa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://drafthe.ru/uplcv?utm_term=watch+madea%27s+family+reunion+full+movie+free PDF link annotation
    • http://shsuorui.com/uploadfiles/fckeditor/20210910/file/16312999643759.pdfIn PDF document text
    • http://iacsglobal.iacsinfo.org/content/uploads/files/96861254100.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/66566565677.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/50791259287.pdfIn PDF document text
    • http://coumert.com/images/file/44776997446.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6b3cbfc394bbceb76edec03c159ab592/74140223462.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/75122665632.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/dejodezavatagigotilaletew.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210902013258.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/99781351779.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/repugaxujejalawolit.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/25249f570c86b77be1d83de247c6a887/xebokowesixupinizo.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/204704_kabunuxebukazobaxizivokor.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/nowivunafiwesunibopofex.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/sasug.pdfIn PDF document text
    • https://tuinvandecruys.be/file/77136067550.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/vefidefomefubinefu.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/94714350989.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/sexapujopun.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/56122901689.pdfIn PDF document text
    • http://rrarental.org/upload/file/jatadagagipiso.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_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E26 11048 bytes
SHA-256: 780b50c16b2e02922ffd096dcea5f1268d376c6aa4448acd9833a63e3934a2fc
font_02_sfnt_off000127ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CA 17628 bytes
SHA-256: 9976d11403c0c0d077067f438253e253b4fba8d5e0ad8367485002322b60ab7e

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