Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc17f60abce826bc…

MALICIOUS

PDF

82.2 KB Created: 2021-10-07 22:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1a2a08dec56d5b56bb43065d168c72f7 SHA-1: 76a0bbb8dde43faae06ef34f4afe71a19baa7600 SHA-256: bc17f60abce826bcbdc32887f7d56523c1a26192cf2f2d93bcc8c1195bd0805d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating the PDF is structured to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wastran.ru/uplcv?utm_term=how+many+levels+have+candy+crush PDF link annotation
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141c288a3fa1---wofalazonureki.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/juzoguguvunubuwas.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/48001261996.pdfIn PDF document text
    • https://verner.lt/images/files/69756370208.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/82371093967.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/63314421034.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/batenazigevoz.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/xajomibisotusafibutuferu.pdfIn PDF document text
    • https://zdravka.hlpr.hr/userfiles/file/34580929414.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/45450385800.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/sofabuvogoniluzidi.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210929024355.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/wofamidilenagobal.pdfIn PDF document text
    • https://e-midas.ro/files/file/vopupasur.pdfIn PDF document text
    • http://bdsductri.com/upload/files/33537814156.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/bexiguwefumojobapis.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/kakijiji.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/19724731059.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/92261439529.pdfIn PDF document text
    • http://health-bridge.in/upload/file/kipobikesuvokudute.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/kozezipop.pdfIn PDF document text
    • https://sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615c0db8cdcd3---kolugoxibizelukadarezopox.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/13899056772.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_off0000db46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 18260 bytes
SHA-256: ee3c716314b6530e9a084c5b61a7f0cd80f51dfec242406942732fd6abdb33e7
font_01_sfnt_off00010ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F7 10804 bytes
SHA-256: 5697c1eb392e3d2fca8067a78d00f2615aaea8cea4c67a0fff430de70fb818dd

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