Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a3c829ba6d33a7…

MALICIOUS

PDF

78.7 KB Created: 2021-09-21 04:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7d5b4d2e7291b9497d3d73f9b0967192 SHA-1: ede1ca999e85e6e847dbd809d82b0544492429d2 SHA-256: d4a3c829ba6d33a7f2bf1c9a9b4688fec8d79639da692c47319d5550dc2d8e1c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links and a visual download button suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious workflow, likely involving the exploitation of PDF vulnerabilities or social engineering to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • 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 https://inwebjor.ru/uplcv?utm_term=drivers+de+android+para+pc PDF link annotation
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/74f76c75d2afc199caa3354590bcbf33/28135265723.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/13200497566.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/90551611287.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/fapowuxefejogoniw.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/nevexenabiwewadisawet.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/57873626773.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/37645467897.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/selirufumiramujixalexal.pdfIn PDF document text
    • https://kokomanis.com/contents/files/44888890103.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/kovodusuvemitanedefud.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131ccfe51f9a---kogazezuzisunomutez.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/41954055029.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/59512820948.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/nesuwakavop.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/xotadavuwivigalage.pdfIn PDF document text
    • https://proxus.nl/file/82252897208.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/bomatefafizigot.pdfIn PDF document text
    • http://canadianrockies.info/files/file/32787769277.pdfIn PDF document text
    • http://watch62.ru/files/files/zakejedovifipatu.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/tafiwazexisowase.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/julaxoduxinosimaduvulol.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/nixamufa.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/5932320278.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/xupetoron.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/81598438511.pdfIn PDF document text
    • 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_off0000cfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 10432 bytes
SHA-256: 80323a102d439a61badfe99fd27046d1f5f8490a21dfb2ed758675d51f68e2f6
font_02_sfnt_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 17332 bytes
SHA-256: 5b2d82cbd7fb26faaa3267254634698e3a511c49f2c6f8fd1c363169733a07b4