Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e75d88e4bd50f98…

MALICIOUS

PDF

89.3 KB Created: 2021-09-20 09:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d11bdd9d474a828ccf694e9ab169171a SHA-1: f8c090bc8be9d3a0b4dee49181872ad28031bef7 SHA-256: 3e75d88e4bd50f98807d43af13e819c6c68338b5b12559174eff89cf94edda3e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also exhibits characteristics of a link farm, with numerous distinct hosts and disposable URLs, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded JavaScript indicates a potential for executing malicious code within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://srmtteaparty.com/uploads/files/202109091351106502.pdf In PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/juwusutanoxawomed.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3ff97d11ae7e2762e8e4551898be92a5/nixinosimike.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/3728112266.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/rezafifosagofuwovaze.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/27926985261.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/16152928597.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/99296317654.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/85783009918.pdfIn PDF document text
    • https://proia.bg/userfiles/file/22024354778.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/28995388679.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/42380763954.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109150846503823.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16147b03ce22b5---koxemonebuxexo.pdfIn PDF document text
    • https://nada70.org/userfiles/file/50507721593.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/tafafevifamidefifaxenedek.pdfIn PDF document text
    • https://reha.bg/content/upload/file/ripekafewumuvo.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/buvasedumupuporebusokegi.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/63675573529.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/24209459082.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/36290311191.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/96826789676.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/zijawojivojazupoxopinabu.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/48680747357.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/kapun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+listen+to+am+radio+on+androidPDF 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_off0000fb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 17356 bytes
SHA-256: feaf0b59cb470b52b5ad93d0900f8056e49b992a73f36e22207d84550afde783
font_01_sfnt_off000127b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCC 10484 bytes
SHA-256: 210afbaabda3a7b012fc452e1b78f09fbd90da1794a65e505f3973c24cb63711