Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2817ad955ad7de7…

MALICIOUS

PDF

72.4 KB Created: 2021-09-14 11:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5521c0e62750ccb1d453d4bd58a5f9d6 SHA-1: 192a53030ef43a862ca23549574b09fad996961d SHA-256: c2817ad955ad7de73dd298b1e7aa9d7d2ba4d228ce9255b0ef691abd15941b4d
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest an attempt to host and distribute malicious files, likely as part of a phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bright-mineral.com/uploadfile/file/2021091014501861.pdf In PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/18429372638.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/93422993431.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d381c679d7---pebanuvijexir.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210904111719164045feb5pilxtaih.pdfIn PDF document text
    • https://sanagustin.cl/files/punemiwogefijugo.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/zopujosuwetozozimokuwaw.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/nutekevulukazo.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/pigewekivakimawawivozu.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/74539435577.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/mumonapetesozikaw.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/21608603275.pdfIn PDF document text
    • https://ip-pharma.net/data/files/zurikujatagu.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210902_4B349A8DCF9733A0.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/56241611297.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/7a12f4f11e0a2519f5fdd2f5d4744f6a/34410535543.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/48151879419.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/23546707012.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/91180207848.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109121427581351.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/6475889696.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/98224710613.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/fudesutetozideragofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=a+textbook+of+trigonometry+kc+sinha+pdfPDF 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_off0000b39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39F 11452 bytes
SHA-256: bfbb2c0cbcebba338133cdde96db19b52ee6329a103402d830dc2846a495c2e8
font_01_sfnt_off0000ce22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE22 17948 bytes
SHA-256: 012c608c3d41379c973d9f0c217535e07a58de6507914cdeebff242fc2148df9
font_02_sfnt_off0000fc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.