Malicious PDF — malware analysis report

Static analysis result for SHA-256 6820fa896eb13ada…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 08:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f0edf19ba7cf0b36060f8fb60c6d9c8 SHA-1: fbc71f48e4ff9be4aa74502df406609010926c55 SHA-256: 6820fa896eb13ada2cdbd923653a29e653cd67cd1efe8da813daeb0d331fd4e3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://bdsductri.com/upload/files/44154715573.pdf In PDF document text
    • http://thongthien.vn/upload/files/donejifusovorizexewok.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d42652fbcdb8de7e8e22af80342a43bb/51495879223.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/netosetotomotejiluxelo.pdfIn PDF document text
    • http://technocom.pl/editor/file/sukunebobovinojolol.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/veriwepanamokigokopali.pdfIn PDF document text
    • https://panama4d.com/contents/files/lejanisosanunapuno.pdfIn PDF document text
    • http://bamila.vn/luutru/files/tavamefonoluduzuroxogizi.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/94642182141.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/rigabuturikogaxuzenedupif.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/zaxoronemipe.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/31681648405.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/40345525009.pdfIn PDF document text
    • https://andana.us/files/files/17115803343.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/dosofetikezujaguvi.pdfIn PDF document text
    • https://granitnet.hu/editor_up/37919000683.pdfIn PDF document text
    • http://gzmingjun.com/uploadfile/files/20210918_132354.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6d038fb8d5d80fc5ed40fcf8cf1b6fdc/belugotumubisafolov.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/96055931219.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/20099771808.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/25544282229.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210913_31C31877B0C7FD32.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=www+movierulz+plz+sarileru+neekevvaruPDF link annotation
    • https://mediaget.com/userfiles/files/tejosufopax.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_off0000ae18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE18 14816 bytes
SHA-256: c7c77ffe8e6475a2c172370c3504aaa5e44b6229c18cbed67a566dc761511038
font_01_sfnt_off0000d32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 10712 bytes
SHA-256: 7b4540f12f77a357777b73fa1be1868396cfe4cdcc360ec8212d85c520305a84

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