Malicious PDF — malware analysis report

Static analysis result for SHA-256 198876bb43b6a1cc…

MALICIOUS

PDF

75.6 KB Created: 2021-09-18 09:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c60bb55ee58229c568b3e1f0c8b33800 SHA-1: b70d5711c691fa6548670b3b6988af717e084877 SHA-256: 198876bb43b6a1ccf16491ae698877a234f595c91f2697bf90d5b16d93903516
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or content-luring campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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 https://vietnam-pump.com/userfiles/file/movas.pdf In PDF document text
    • https://npkfertilizerproduction.com/d/files/fokipupunaxojosub.pdfIn PDF document text
    • http://epmachine.ru/d/files/lerujujigujole.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/xuzubokiwurajomabufazim.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac389d2e1---27817033049.pdfIn PDF document text
    • http://turatabor.hu/media/33344524458.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210917054502.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/suwinivasatevinenugepig.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/zujiroguwokulexusamub.pdfIn PDF document text
    • http://jainfarms.com/uploads/boxufazabexajibapetajefot.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/42675760485.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/94556567193.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210905_065940.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/xubifozilizewur.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/pikip.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/lamujilikuneruvera.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/rupekavezagufufofof.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/e0803c19d07e668685f662882520c9cf/27021781947.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/12825362681.pdfIn PDF document text
    • http://njchemland.com/upload/files/74199728301.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/zupivusigumed.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/gijokopusimufat.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/92708650240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=wap+roblox+id+codePDF 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_off0000c377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB89 17824 bytes
SHA-256: e70371289c84121e27d8ab516cfeda07f4ec4e1768f427b0c905d02dc02b1a82
font_02_sfnt_off00010a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 10372 bytes
SHA-256: bb768342ae922e9aabf3d8fbbf3a45a7280bf0acefde319734a6e46dbdfbbbcf

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