Malicious PDF — malware analysis report

Static analysis result for SHA-256 1923070539ff46a5…

MALICIOUS

PDF

73.7 KB Created: 2021-09-16 21:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1be25c733042fb65d8d647bcec2cdfe2 SHA-1: f1f3f22cf0e4e2e405dd3b803fc3cb7dd77bf020 SHA-256: 1923070539ff46a5c30d4492ec5999b5b6d7ccf38ba92528951616820b959ace
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 to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest an attempt to distribute further malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://4998horo.gmmwireless.com/contents/files/detafosapaxuvosifujodoli.pdf In PDF document text
    • http://phdpecs.hu/userfiles/files/43342632676.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/40177119700.pdfIn PDF document text
    • http://elskenecologie.nl/files/48392616682.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfaf9bbb84---76465624909.pdfIn PDF document text
    • http://orem.mn/uploads/files/49703523785.pdfIn PDF document text
    • https://etadelloro.it/images/file/19289706823.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/65556797841.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109091322471200.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/1238885751.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/purixelidukapepotaru.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/xolesozadofexujo.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/jokememilodalikotuf.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/xememulajukag.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/89522323704.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/8209734907.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/52535685634.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/xukopigonilujezavunibe.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/80196131651.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137aed4ecc9f---51242482068.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/74942977490.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/wekinevuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=things+fall+apart+norton+critical+edition+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_off0000bdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCE 10864 bytes
SHA-256: 5b4f604151d506e9fdcdb23450f49d3ead50b56e66df7bc12cb4112b63cf43e2
font_01_sfnt_off0000d69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 16300 bytes
SHA-256: f00d2dc003889e9470913dd82492eb4a5626a8408c3b9aa10d8adc35f43574f3

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