Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1249f2b9b67936f…

MALICIOUS

PDF

91.5 KB Created: 2021-09-19 03:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6901a271b953371e1075087d228e6433 SHA-1: 742f6c546aa910882d08b22767719f0513fa795f SHA-256: a1249f2b9b67936fdee5717a8c48098cb3a87a9b8ae278d3dd4730f9ae2d8d82
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://chafewyuok.handysociality.com/upload/files/wirebafolojoraba.pdf In PDF document text
    • http://chugguwang.com/files/fckeditor/file/45461903041.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/vanep.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/78872744940.pdfIn PDF document text
    • http://allier-genealogie.org/File:/nokufamuv.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/kopesoridepenuvibusiz.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/11155859782.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/zijifufujoxiwaw.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/6636655633.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/73982850708.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/47229863493.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/63890655271.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/rikesula.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/72549392048.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/85503935879.pdfIn PDF document text
    • http://hangquangauto.com/files/89238139204.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/11545030955.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/37415826877.pdfIn PDF document text
    • https://nexapos.com/upload/files/16114577868.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/dbf083be2f53825b0bf45e4df912fb41/fuvelosomerasifefino.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/jowifosukekas.pdfIn PDF document text
    • http://corkpotters.com/images/10170847473.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/jofedajoj.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/dokiwiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=wrestling+revolution+3d+wwe+2k17+mod+downloadPDF 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_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 18684 bytes
SHA-256: 68d498a3e269fd3901349baffdf2dad8998fa83ad322a75bb76db929bbf9dec1
font_01_sfnt_off00012d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D68 11320 bytes
SHA-256: 5b6ede23abc7581b3a353ec570534687a7322e3f745f05b44d1a3945a372d52f
font_02_sfnt_off00014814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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