Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4b3be9be7b0571…

MALICIOUS

PDF

88.4 KB Created: 2021-09-20 06:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a9b705796ad6def4a5676b9ab1a8601 SHA-1: 14583dcc887774f7b0a2f75826b75229122bba11 SHA-256: 8d4b3be9be7b05712163c61183e3cc66e11bd712859bf1e1f83a0b4653a4c897
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the link farm heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://laborke.ru/uplcv?utm_term=captain+america+civil+war+in+tamil+full+movie PDF link annotation
    • http://recuva.kr/upload/fck_img/1631260819/file/75847049540.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/7868502366.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/tewuwerixoxidapelawa.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/98573734080.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/vidajoz.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/44032103008.pdfIn PDF document text
    • https://atavio.ru/files/file/dugisigegog.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/97066678961.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/lowadugosexilorejaxus.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/pemuxinenoledetak.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/diveduvutu.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/36777385907.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/siladi.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///wupagosupenusexotaxo.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/75316252179.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/60892168798.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/62170798761.pdfIn PDF document text
    • https://pindimana.in/uploads/file/14186710406.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/wilizerimumexibamejalo.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161427b4d2506e---fagavusakanujefez.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/bivopisirozosazejiwomorud.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/7571745935.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/tegexirej.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_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 18136 bytes
SHA-256: d8898a1849c7809d383688ae5e35d1bb0db5b71f2d4174186863ef9e25050a0d
font_01_sfnt_off000122f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0D 10756 bytes
SHA-256: 8a8f6e03028e956bd91cb1cd76c33c8eeb180d4d5371fed277a7c24e30ab4507