Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf7a37936d32899…

MALICIOUS

PDF

76.3 KB Created: 2021-09-12 16:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b3e73d5d91be956ba23fe18730002dda SHA-1: b433480837113dcc9aa0606c39e8d6d9b1f31c14 SHA-256: dbf7a37936d32899e633e13d2fd636772428c5f5d28337b7c22bca182148c27e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=excel+to+convert+pdf+file PDF link annotation
    • https://qnzar.com/files/85844999735.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/51943938422.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/84717163298.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/7023615026.pdfIn PDF document text
    • http://fructusartis.com/i/File/58557993890.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/lafolemebikodewadogusetex.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/jofuvivafagu.pdfIn PDF document text
    • http://coolscape.info/images/files/76703122337.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/7871701445.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/jakabexewoxu.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/jusanapopupuvuvakixaza.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/svtp3ng076nlmtfuclutesnjem/terupivavokapuzobitezu.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/gawiwipodudixerop.pdfIn PDF document text
    • http://linza-market.ru/upload/files/81995376958.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/58128635100.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/87357207762.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210903110055.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/85726347582.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091118075611.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/84653259639.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161365efa6e9a2---44737035098.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/vofusewefilomuxilodutubik.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/52985315579.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/relupaluguxidej.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_off0000c89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89F 16688 bytes
SHA-256: 689421faebf3aaf40bef17b6ec862d8bf59840ecfd3ffbacd78e4559ee177fa9
font_01_sfnt_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 10436 bytes
SHA-256: 8c8a31da04d276b31033d502fed20a1adefedacb374d7c640bbb522ac89420d8
font_02_sfnt_off00010b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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