Malicious PDF — malware analysis report

Static analysis result for SHA-256 e604849d65ec5b90…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 09:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ff1b13340fbe69cfa96f4201097bf4d SHA-1: d264046d59ad10c5220ee396e10b16f0702c5b09 SHA-256: e604849d65ec5b904e17fa97251cd2c64649393b0359a47e4e114349d99a08f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=adjust+screen+size+android
    • https://roshnaai.com/ckfinder/userfiles/files/ruterejegolamodaposabibe.pdf
    • https://owop.challengersports.com/userfiles/files/topegapewizuzakewe.pdf
    • http://yogaschoolofkerala.com/photos/editor/files/biraxorebaliz.pdf
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/73886135566.pdf
    • http://inlovehuahin.com/file_media/file_image/file/nekuxi.pdf
    • http://labsshop.com/d/files/nezilajiragomajemaramulo.pdf
    • https://xtrafitcoaching.com/www/images/files/dibuwovifisotisaxeto.pdf
    • http://sarkar.ie/userfiles/file/kisuzegaw.pdf
    • https://quangtriasianwindow.com/uploads/image/files/49552621614.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/66911787851.pdf
    • http://arabstina.com/ckfinder/userfiles/files/52560196634.pdf
    • https://contact-house.com/fckeditor/upload/file/tatejurowek.pdf
    • http://maroba-zirndorf.de/file/repowijiwinipaxeluwivitix.pdf
    • https://worldpigment.com/image/upload/File/59840350225.pdf
    • https://bientannamhuy.com/wp-content/uploads/files/zelodolokilipurikaxi.pdf
    • http://www.77ice.com/upload/files/vuguselerojul.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/kudete.pdf
    • http://ivankrivanek.com/userfiles/file/gedisasazud.pdf
    • https://pt2-turbo-j3t.com/contents/files/vizasununuzuxoludesan.pdf
    • http://dglytbt.com/upfolder/e/files/20210901134619.pdf
    • https://austdoorcaocap.com/upload/files/75358427686.pdf
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/5293262827.pdf
    • http://poultech.net/d/files/futezotamuvinogexemumuz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d91e.bin
0472fdfc568397dd46916f96133f89ca6e430c8f789749e115b5d935cc404f47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 10588 bytes
font_01_sfnt_off0000f177.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 16792 bytes
font_02_sfnt_off00010989.bin
1f75aa35183255a58c27c3bb44d1ae492908a435fbbc9e474b37acaaa79908ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10989 17108 bytes

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