Malicious PDF — malware analysis report

Static analysis result for SHA-256 9126cfe24a7c060b…

MALICIOUS

PDF

84.9 KB Created: 2021-09-13 17:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 220b5d06cad8f2961689efdc6efcb5ba SHA-1: f068cd5dc8ebfea01dd8a1b4877f61a0206f3ad9 SHA-256: 9126cfe24a7c060b44355b54aa18a55e3beedeb2c57d412858a0fd42afc8f68f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded links, many pointing to unknown or potentially malicious domains, suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of these links as a potential link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://ud2-140.com/files/nezugigife.pdf In PDF document text
    • http://vngo-cc.vn/cooker/public/files/52406046041.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/lodapevojoviserefejus.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/dukenulolawozo.pdfIn PDF document text
    • https://salwangurugram.com/files/jesupabe.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/37642653095.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/tuxuwuz.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/75113323060.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/55999797526.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/82257074807.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/18502065194.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/94139949896.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/saseludifudigaregevix.pdfIn PDF document text
    • http://alstar.uz/images/shared/file/5299015312.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/fawixu.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/57663275437.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/38157126010.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/natopuxaf.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/14208013220.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a48e52f151---lebimutinuku.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/fogosadanikigakobubu.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/73086187174.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210904_102037_9044.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/kumozejerujironezidu.pdfIn PDF document text
    • http://boldogelet.hu/media/juneg.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/daiofnh7sg6c8ktvdna8krp121/33363622179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=disney+movie+anywhere+androidPDF link annotation
    • 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_off0000e7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 18088 bytes
SHA-256: 2eab4b4becb910d4e11b2e879e628f809d768807746e9fc8e9f674cf3d72bf4f
font_01_sfnt_off00011642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11642 10636 bytes
SHA-256: 17e62137c008476004be6ebd0abc70d6ed0dbf493bf6821464eecd51cb911a22
font_02_sfnt_off00012e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1