Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e62e1576f637ba9…

MALICIOUS

PDF

73.4 KB Created: 2021-09-21 21:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fa3a8aecf2692b289b3010d75da3427a SHA-1: 5b41c8ea2528abca8f3cb38d0649d89de92d7fe8 SHA-256: 7e62e1576f637ba90ddc461ce94b612b7a93d51ba9aec6bda21d9d8830468b0b
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external URLs, many of which are hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JS suggests an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8647

Heuristics 6

  • 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.
  • 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
  • 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://gpkoaee.ru/ckfinder/userfiles/files/feregusig.pdf In PDF document text
    • http://refpecsbelvaros.hu/kepek/files/daxunuxanojunetotinuwazoz.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/19001471590.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/30146987141.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/62460575543.pdfIn PDF document text
    • http://riph.pl/userfiles/file/kagiluwitapaxumonasodur.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/kokufelukagepiwakamovobat.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/85817531619.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/24183593444.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/zorotuvurukejokivubejelu.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/16985467477.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/20190293654.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/90966970283.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/mitinunepapinofokim.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/gatalonepesaroluwawanaxax.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/50226560427.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/pibedolitonutu.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/34904123915.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/85663836731.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/pimatebupifetaw.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/maledijemagafeva.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/13027694364.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/55398496110.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/21292748084.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/boduron.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gta+5+ppsspp+game+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 10804 bytes
SHA-256: af18473d3c0c7ea4f724daada7329626ff4df06de646235aeb4d9cfd7d1fa846
font_01_sfnt_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 17960 bytes
SHA-256: dc4a6f75444e556e27047c98f85037298c1726e6e356119154d09109c6ef27e7

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