Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0d3f3d7dfd69ad…

MALICIOUS

PDF

83.5 KB Created: 2021-09-21 21:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 892ccd07e6cdce8bbc533f0cf07d180f SHA-1: c6147ac26ebf0601e831cd770ab35821197d7df2 SHA-256: da0d3f3d7dfd69ad18107f4b241c2c9691f34e7db9ffed0582efeffc1666ab59
222 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and links to algorithmically generated URLs, indicating a malicious intent to download further payloads. The presence of a 'download button' lure and a 'password-protected archive' hint suggests a phishing or social engineering attack. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 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://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_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
font_02_sfnt_off00012825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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