Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d8ec8e20908968…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 12:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 88afa6e888dceb2075088698da58e8f4 SHA-1: 298823c51f9efdf452587de3e1d414d7269780e4 SHA-256: 33d8ec8e209089688a7f5557ce189738204169c8a364fa6d11fd202aa6f3a9c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on distinct domains, many of which are unknown or potentially malicious. The presence of embedded URLs and the PDF structure suggest an attempt to obscure the malicious intent and distribute further content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://glassick.com/userfiles/file/xokojutidudazosoked.pdf In PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/30be75d4de8e7b5985eaf4d425015697/66508341637.pdfIn PDF document text
    • http://bptramptour.pl/files/file/23487379282.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/bomuto.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/farezurijabuv.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/49071133780.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/tatuxuguvopudavaj.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/67194812525.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/80444474650.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/90802600096.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/bezenoda.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/jajosaruvarubigezazatij.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/96931571975.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/ac2be075e7b36eaa2ba74798d091b580/77909970991.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/6284381403.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/54934087244.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/sekexadidinegil.pdfIn PDF document text
    • http://climtech.com/files/files/reloruveforijovujuz.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/15431853532.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/71571638947.pdfIn PDF document text
    • https://maturana.cl/upload/file/72278745064.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/kaxofixagemazexado.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/duginorunago.pdfIn PDF document text
    • http://watch62.ru/files/files/mubanapuxagexefaxiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+os+download+for+virtualboxPDF 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_off0000aed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED8 14880 bytes
SHA-256: b3da881a59d728412050b4acd2a32ccdbf1387037d16343ed64894bb4fb75806
font_01_sfnt_off0000d380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 10692 bytes
SHA-256: 77623490dca631a1d9e7902f6df80acc6598ebc1a0513430a2dd361eee96dd03