Malicious PDF — malware analysis report

Static analysis result for SHA-256 554078092423fd3b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 17:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7f06edd21b4dad8a6f6564513944688 SHA-1: 007e9e056d6b5e5a3f6e93a8ed0359680a9917cb SHA-256: 554078092423fd3b8236c6f9e6bc6362f455b7650dbb07e0ac1d114f8d88475e
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or Business Email Compromise (BEC) attack, as indicated by heuristics flagging it as a 'Recovery secret / private key request' and 'Payment redirection / bank-detail change lure'. Although no executable scripts were extracted, the presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests a multi-stage attack designed to lead the user to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • 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://investmentskillsgroup.com/images/userfiles/file/bipumovokesozud.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/80585705577.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/lokejomuwatubimexemakunu.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/18177194730.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/rilajidukokazes.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/savized.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/56377696542.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/98847608841.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/95957850361.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/69821204807.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/zowuj.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/vixezonapogimaw.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/25963228239.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/lujomuvozopes.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/12888177998.pdfIn PDF document text
    • https://bauarch.bg/files/92445794788.pdfIn PDF document text
    • http://farmina.ru/uploads/files/todozedolezaxedalev.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140509ca090e---7918824705.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/fukizop.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/vigitefupesarazoxeno.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/22370853765.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/12776976077.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffaf5b2f6d---8375647565.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/vajopabanetafope.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/61670549400.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/15073007641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=www+hotmail+comaPDF 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_off0000e1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 17884 bytes
SHA-256: 8cd55a0d5814456dbedfd78fcd750b592782b9603a56cf394aa74a476a4c073a
font_01_sfnt_off00010fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12805 10072 bytes
SHA-256: 4b44fe44efe0e144f6eae2774118f68b648921e9d6aca80fba2505f4211991bb

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