Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d8a880585b4a1c…

MALICIOUS

PDF

69.8 KB Created: 2021-09-17 13:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 861cf2f5526dbb6576c09aa6ab894ed1 SHA-1: 3106a17936d0e379bb1161b94216b87363428890 SHA-256: e7d8a880585b4a1ca662cd98056f7d1ec11aa3a526fa6251e7bc0c1c5870fc4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute phishing content or malware. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://gostinica-domodedovo.ru/files/sajuxuwoxejumufovelafit.pdf In PDF document text
    • http://gift-founder.com/archive/upload/files/fivomurapebelinoguna.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/wuluzujufux.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/97123566424.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dg05slmq3hbr0dffvq9u60kbm3/zulexe.pdfIn PDF document text
    • http://koutingchina.com/upload/files/kadejobebuxirebegedu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613402f374e82---22539661378.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/witebijuvon.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/terimej.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/xepipufoje.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/sukot.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/25409721733.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/pesifeporexomeru.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/66582787737.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/pifipozawitem.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/74355614898.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/127080963.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021091105094373499.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/girifepuvemirotib.pdfIn PDF document text
    • http://df-foundry.net/d/files/50253233613.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/9820196997.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/43206785567.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/95391673500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+i+hack+any+gamePDF 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_off0000b3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF0 10548 bytes
SHA-256: d5f50baa445c3fd085360f60d3c2e15d1c0a8e300a31d80872cafef373918444
font_02_sfnt_off0000e3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 15032 bytes
SHA-256: 95723c831d3a12d9557d7eaa2340a454d86a40d94ed4bd1f6e7bc0e0d5191661