Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4c0f94a89a8b3e…

MALICIOUS

PDF

74.3 KB Created: 2021-09-20 17:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 86a685dd8764cf669411c240264c863d SHA-1: 86df15cfc6ec011e03593c75a4250608ef413d6c SHA-256: aa4c0f94a89a8b3e5b9b1b399783a22f92e9ff21e35e4dcd68f168ffff42c068
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to link farms or disposable hosting, suggesting a redirection mechanism to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF's purpose is to host multiple links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=vola+tv+app PDF link annotation
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/67782547020.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/46246393027.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/97356587186.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/saxunigijawuwunij.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/59921446973.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/gusinusewozokamo.pdfIn PDF document text
    • http://dobermanncz.eu/files/24754814134.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/masuzeruxo.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/88917616265.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/finomokopos.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/miwifaxezinanapiwogesof.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161416c6fa6f24---rukovokitadalezureta.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/mulepa.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/lulajuximivibafunizoji.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/muzineb.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161483e02321a6---29481361876.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/12347352416.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/zubafekogamurawurevavuz.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/xukopagarerakisagoxi.pdfIn PDF document text
    • https://aokman-drive.com/d/files/titotelukotuvoj.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/36126873826.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/bekobopexo.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/xenofug.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210912103702.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/42286515397.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_off0000c456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC456 16308 bytes
SHA-256: f664c1b64f957d60336236effe1173a12efcacabd2acfce922ff9fe80e103ba6
font_01_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 9684 bytes
SHA-256: 57d0e4079ae75365f4685fa8d946a59fbef6029e8eec99b96b3e7787d9392027
font_02_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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