Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e28b9b8f9fbcad7…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 06:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7640541ad8e04fc6313fad7057fbcbf7 SHA-1: 66d746f0b08f5b252afe4b676744f4d27170ed9c SHA-256: 1e28b9b8f9fbcad7e04a1ce40022e643bf00f765dfb075734551d0458a79f222
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to manipulate search engine results or distribute additional malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 5

  • 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.
  • 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://cissud.eu/uploads/ck_editor/files/nabufutetilokow.pdf In PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbb349c3c9---16195699940.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/rupoxuxu.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/79965607931.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/noviraxexudi.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/sulebisimikenimog.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/2852691873.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/mizexusami.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210923100537.pdfIn PDF document text
    • http://e-menu.hu/editor_up/82987671597.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/nobapiwebibaven.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/xufawipemowokotevafelobe.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ac779946109056f45cc48f95477016fc/1168149226.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/bobozidibonologe.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/91392805445.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/vigebegisaget.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/jopiraso.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/63847699741.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/dufaleze.pdfIn PDF document text
    • https://iword.de/userfiles/file/mijujuzupubu.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/7606184144.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/73524226567.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/66685020193.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/bitepinibivasijite.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/fefavad.pdfIn PDF document text
    • http://msiutilities.biz/documents/2765135141.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/43899731887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=blue+play+apk+2021PDF 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_off0000b230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA42 17468 bytes
SHA-256: 6ffb824a563d2a8911630b493a283050e43bccacd6d98f82424b40a378b5ec85
font_02_sfnt_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 10216 bytes
SHA-256: 2b6d9c575ce08a7d3e672b165e023d8deddcc8b21979b19b8699ac19cb70ecdf