Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ea34b787c5a5cb…

MALICIOUS

PDF

84.8 KB Created: 2021-09-15 17:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b80013d91f49ff034407925cbbd76e3a SHA-1: dfa1e8931ec847f109136615b52a36a7ae2b4493 SHA-256: 38ea34b787c5a5cbe3b212f99d68827deb351eb61c2582ea9a7f270992bc1be2
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple URLs, indicating it is designed to download and execute further malicious content. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' strongly suggests the document instructs the user to perform actions that lead to command execution, likely to facilitate the download and execution of a second-stage payload from one of the provided URLs. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 https://crewmak.ru/uplcv?utm_term=deleted+photos+in+mi+phone PDF link annotation
    • http://chatyzvule.cz/uploads/37353113967.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/xufawetoleso.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/85001534832.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/ponuloxofazavurupuf.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/22060630681.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/fumepabi.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/53363449239.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///17539118026.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/20037850127.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630528304.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/lagufefevodupiruneruz.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/41416074618.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/55622091151.pdfIn PDF document text
    • https://inks.bg/userfiles/file/dusite.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/81098125460.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/gevevamokemeruwetu.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/simodoxil.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d013daea4e---60855762707.pdfIn PDF document text
    • http://maulich.vn/attachment/files/vovug.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/defomil.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/rutusazaxapewaguj.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/28262735301.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/wufefoxufumaxaxepojewer.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/16082976487.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/26067121350.pdfIn PDF document text
    • 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_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 18988 bytes
SHA-256: c82ccf25322506df202ae7eb9d055f366b0f709ad11b48e9adf117e29e8ccc70
font_01_sfnt_off000115eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E02 10396 bytes
SHA-256: 49b00bef6b6e19c1b2a2ae5cf1fda55603e1f0f1147aa8fb66de5015b35761d0

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