Malicious PDF — malware analysis report

Static analysis result for SHA-256 86856a7d5b922a41…

MALICIOUS

PDF

89.8 KB Created: 2021-10-04 12:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c1ec90923f8f7f61f53c2a93111451fd SHA-1: 7b6b3ef504fdea0804811fe9a08d5d3166b08aee SHA-256: 86856a7d5b922a415727a171ed4ec56f4c30373a9c872b5fce54105ce70793c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates redirection to external URLs, as suggested by the PDF_URI heuristic, which is a typical phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://webspace.mysdam.net/images/newsletter/files/muravamibirawopifulaluxav.pdf In PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/46530668494.pdfIn PDF document text
    • https://oferta.lt/i/File/12548240538.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109042359382528.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/xefojojewamife.pdfIn PDF document text
    • http://lse.hu/userfiles/file/76116839207.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/71384731683.pdfIn PDF document text
    • https://fond.ru/userfiles/file/60933804446.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109251908268192.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/74652371011.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/zanevol.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210906115614.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/81884577831.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c0820499d923c3a40d687c10c043d060/mofuvasimaxoga.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/sogexawelej.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/fuxobunisunepu.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/70261771085.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/43613972837.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/94402646893.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/78089351414.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/givomowazapudebidele.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/18837346723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=simple+old+fashionedPDF 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_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E61 10640 bytes
SHA-256: 48caf3d736a01fcc9eff2d1b678e5ccf041ae5f0a5a6e0bbf238f5ce64225ed0
font_02_sfnt_off0001266d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266D 19616 bytes
SHA-256: 7967023d65aa1255f6e073d8b65cef9f572a95df7f4eefad06b5752f56f999df

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