Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39bb769da5e58c7…

MALICIOUS

PDF

77.0 KB Created: 2021-09-16 01:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd6ded4fbcbd41d0b8800cee50c3f213 SHA-1: 3695fd63aa84e03f441b38a5161c967f4598f412 SHA-256: f39bb769da5e58c7a2ca139c7e315885bd94137e6ffa91268a7d4ac064ad2550
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=hello+world+program+in+kotlin+android+studio PDF link annotation
    • http://vaynhe.com/upload/files/votagumigigug.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/guzedigodumun.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/fegak.pdfIn PDF document text
    • https://magatek.com/documents/file/6646346359.pdfIn PDF document text
    • https://pr-dienst.ch/file/69738193700.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/todigu.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/pepupeze.pdfIn PDF document text
    • https://advik.net/userfiles/file/28783083860.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/dejelinov.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/noxefi.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/644e44f4eb6e26555d1725a93b3841be/24773261899.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/19966700885.pdfIn PDF document text
    • http://tlca.com/Content/uploads/files/93649089743.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/35429796530.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18337083346.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-10/20210910105511104597.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613db980c0ea7---matebokubowutulapofax.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/34036892066.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/sotefilazip.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/bikilipelukogowizexaduvup.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/saxobamoguwisegolixo.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/kogupenusuvopimexatire.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/tovevezelitazafif.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_off0000bc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1B 16168 bytes
SHA-256: 8525dfed91c83053d28c4bb6f3cbffb54fda255c93a68bf48305094908aafcaf
font_01_sfnt_off0000e5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F4 15692 bytes
SHA-256: 1219075cc505adbc2a556322a1e080f4cc8365c57dc777afe2c15016b54a90c5
font_02_sfnt_off00010e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1