Malicious PDF — malware analysis report

Static analysis result for SHA-256 c666ae9562e9f363…

MALICIOUS

PDF

85.0 KB Created: 2021-10-07 06:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 29cfac04f6682a56c3972b6b4c163a80 SHA-1: 4d62dbd0ac1b15f591e46355b594c53a561c3a5e SHA-256: c666ae9562e9f36387535e0bb977caa3270681d72d676f522eb205f4826fd95d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating it's a phishing trojan. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The PDF also functions as a link farm, pointing to numerous external URLs, many of which are likely part of a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://perechen-jurnalov.ru/js/ckfinder/userfiles/files/24541414761.pdf In PDF document text
    • https://zohopin.com/calisma2/files/uploads/73323250880.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/81029512896.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/dogexeruwu.pdfIn PDF document text
    • http://jbdclothiers.net/emailer/userfiles/file/64710358780.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/wusatigeloroxunukaz.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/ruzenubarekovuruko.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132f9c94d959---80331814262.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/xusosaresere.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/73602352899.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/96717118938.pdfIn PDF document text
    • https://kar360.com/resimler/files/31492342320.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/89698715172.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/dozikutepu.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/88147590732.pdfIn PDF document text
    • https://bevillelecomte.com/ckfinder/userfiles/files/43961266930.pdfIn PDF document text
    • http://hnyinfeng.com/d/files/lofojesimutanu.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/42410199243.pdfIn PDF document text
    • http://onlinevay.com/upload/files/xusanavoxoki.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/gupukikezejuworunejad.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/97973667146.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/ruruba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=analytical+engine+was+invented+inPDF 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_off0000e404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC16 19508 bytes
SHA-256: aa1f180d0182dee8ed73b63775640944db686466d479617b1e73cc7213b9e051
font_02_sfnt_off00012e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E91 10572 bytes
SHA-256: 981538dc8bc42e991afd667e767aacd376f0f34e816cc247dd4383052ef33c71

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