Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb4f12c7a6994b1…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 15:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e2bd65b41ea9c249dd498732d146efd4 SHA-1: c1718f27aea1702036632230f089255188364579 SHA-256: 1cb4f12c7a6994b1045ee4b7c74caeb8d06bc3d41a7c1f958168b2e51e2b02ba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also hosts a large number of external links, many of which point to potentially malicious domains, suggesting a phishing or malware distribution attempt. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://garageanything.com/js/upload/files/nanojikev.pdf In PDF document text
    • http://esistore.de/userfiles/file/nozef.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/91446309095.pdfIn PDF document text
    • https://tigapilar.com/upload/files/61903983856.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/bugoduzizusewuroxebavosa.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/21831588508.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/jevutatixiromidepirof.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/47341353538.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/bifogalenuzeziwe.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/12086578718.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/62216958083.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/35074709401.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/dunukaxiwusipipip.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/xivelexevinuwonek.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/junizonodupuv.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/tixixivofozova.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/davebuwawawakafirarizubej.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/89578835521.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/sifelivuvipuwogoz.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/reviwulazetutakamit.pdfIn PDF document text
    • http://nature-revive.org/files/file/68504712286.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/20651992137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+grim+grotto+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_off0000b0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BC 15908 bytes
SHA-256: 50d8f616e33cf6beabecb84e1da283b3933bfc95aa873b7935b22fef838725b7
font_01_sfnt_off0000d8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 10428 bytes
SHA-256: 96938b429bbcfec1fafb88657fcca8f54f480e5c924bd515750ffcdf13f8edb2

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