Malicious PDF — malware analysis report

Static analysis result for SHA-256 79375e2818c3c84b…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 17:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f69029095516a19b25fb6335a3efcf0a SHA-1: 61c8d5d3e9e439b7cd60dd4cefaa15ae43c7edf4 SHA-256: 79375e2818c3c84b97f7fa4b9c3a0c1aa487066f3e134c880a8b4ee1c5e8e2c6
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the heuristic firings strongly indicate malicious intent through URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=qualitative+research+proposal+sample PDF link annotation
    • https://opsclown.it/ckfinder/userfiles/files/557701012.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/41849557147.pdfIn PDF document text
    • http://metallpress.info/files/50457439066.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/25106104097.pdfIn PDF document text
    • http://kesifveotesi.com/files/gajabedoduleniwimagimabom.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/fipufabuzilipunuzan.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/43244684983.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/77803469010.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210908045035.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/jedofizopepigotafakulefu.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/zelugogefijinitegud.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tekaw.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/muderasoroviwugaw.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/bitotefulekewisori.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/fubaranoxudubo.pdfIn PDF document text
    • https://promise-land.com/upload/file/84137597473.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/18373588095.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/19736516588.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/vusegarepejomovuvu.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/besipis.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/52303204235.pdfIn PDF document text
    • https://zzwgjx.com/d/files/92976117069.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/solikipadubodinutevebow.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/71bf466af036e595d9c3352d8c55c4ba/55242858736.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161308abcc700c---17914610189.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_off0000b1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AA 10760 bytes
SHA-256: 4723a86657f26bad0c476871ce2c057d95986af8847932356ab810e806f53eef
font_01_sfnt_off0000ca8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29C 17108 bytes
SHA-256: 654b819bd09c352d3a65a3e81e80dadd9d9ac05469a9e8f706091ea3fef44dbb