Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd300c3e600dd79…

MALICIOUS

PDF

93.1 KB Created: 2021-09-22 16:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66121c5cbf95ff3dd937c5fc0e0e7821 SHA-1: ba51d4732db76e45a4adddca9eaf9b54a5cfa1a2 SHA-256: 9bd300c3e600dd79fe5c65d167384d91ec89e0d1c26cd5e2054f965997c1de6a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting an attempt to obscure malicious destinations or distribute various payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nomylo.ru/uplcv?utm_term=best+disney+world+app+for+android PDF link annotation
    • http://duythuc-bearing.vn/uploads/userfiles/file/32471593184.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/fusipuvamoguna.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/12509051538.pdfIn PDF document text
    • http://dr-temt.ru/images/file/28124696928.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/pboovjvr99s916h9p8drnl6jo3/nanofetipiji.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/92357980020.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219165368495.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/ribuvoduv.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/77822099411.pdfIn PDF document text
    • https://sinarwaja.com/account/files/zokowuzi.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/zanorosefepezemudaga.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/be99a275b48638aa8fa78aa6826b99d6/14479724804.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/fuwijovemetirewo.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/dupunotalofenapixoxutafi.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/rifojifudefinok.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/latikedama.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/bekufefigutapena.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/13386818546.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/pemawerawataw.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/42663129565.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/30355340637.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/nawoguvotufeb.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/padisogezawazamo.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/53418280472.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_off0001036e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036E 18608 bytes
SHA-256: 15bba29c0541cff44107490b06862eda360fb3963eb77685ce450f2f4bc88817
font_01_sfnt_off000133a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BBF 10744 bytes
SHA-256: da5a806bd60477f1e7d2ce777d657a9a325d3d65ad33bad13a4dd998810632a7