Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc7820d034de336…

MALICIOUS

PDF

86.5 KB Created: 2021-09-10 00:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5e859e54ed4dd0b6f3802087e84d873 SHA-1: c335a738ddbcac9d2202da005b6f1f3dc00f4a73 SHA-256: edc7820d034de336b4a29ebf72f54d1dad8de3149d62b00e10626618e0d00bec
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs, many hosted on potentially disposable domains, suggests the PDF is designed to exploit vulnerabilities or lure users to malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a link farm designed for SEO manipulation or to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/domotibaki.pdf In PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/kezedasevifefudokokaliruw.pdfIn PDF document text
    • http://alkanboya.com/files/file///60611376625.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/5691225844.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/32132365836.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/29729822368.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/29673629873.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/41916930585.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/xalowa.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/kaxopomoga.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/94315207745.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/gakudedofo.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/785cbd4380fde19df59f891cb90c7a0c/jalazub.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/wewuzawitepijijonafufim.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613537e2d2c9b---noxebunufugaketumuvi.pdfIn PDF document text
    • https://irantruck.ir/data/file/parikekuxavozebe.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161364ab0b1021---wusaguxago.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/fibezuwenikonaxozejaret.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/50790565972.pdfIn PDF document text
    • http://deltools.com/userfiles/file/jebarufo.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/27801506327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=online+book+reading+app+for+androidPDF 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_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 17884 bytes
SHA-256: d41300838a69e52b4e9656b466be13ee625cfcd2e57f3255742231ee739af939
font_01_sfnt_off00011ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13502 10664 bytes
SHA-256: 7adad911f9e963a275e6452b41eae7d89408a1a9a3faf24fd0d0beac4d76e886