Malicious PDF — malware analysis report

Static analysis result for SHA-256 f824a7ef9d129c2b…

MALICIOUS

PDF

79.1 KB Created: 2021-09-08 15:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6128b272ee624e9a9327426d218d7c8e SHA-1: e23106070609e27a8ffe11e1aea20197a46aa3e5 SHA-256: f824a7ef9d129c2b89359c73c08a17fd101e12a9cee577de6bc3e42d42b00c24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to suspicious PDF files on various domains, suggesting it functions as a link farm for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613413b1c80fa---52764361281.pdf
    • http://daindnc.com/fckeditor/userfiles/file/gajogiju.pdf
    • http://mobitransjogja.com/files/29562079606.pdf
    • https://condicionamentofisico.com/arquivos/file/tikevizodis.pdf
    • https://spyboarcams.com/files/48639843844.pdf
    • http://duoctruongxuan.vn/userfiles/image/file/xiwetigewovalajisunidi.pdf
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/suwoladifobal.pdf
    • http://secretinvitation.net/images/files/92206378284.pdf
    • https://varida-tech.com/ckfinder/userfiles/files/setugud.pdf
    • https://nitdgp.ac.in/uploads/userfiles/files/zozanagidujimeluma.pdf
    • https://xehowo24h.com/images/ckeditor/files/42756058741.pdf
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/xudikavurosoxiji.pdf
    • https://oazapiekna.com/zdjecia/fck/file/fijenu.pdf
    • https://digireg.at/upload/rupoxugav.pdf
    • http://soosanfix.com/upload/fckeditor/file/484864978.pdf
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/67010870228.pdf
    • http://www.colormotion.cz/UserFiles/file/sazojawifuporuwimug.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc595e3246---vexeligukegatunatuvabu.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/8874538922.pdf
    • http://polins.org/public/userfiles/file/gamukedi.pdf
    • https://centrumschoolka.pl/photos/file/kegetumagawefidas.pdf
    • http://arebiatours.com/uploads/files/furerusulasilewurifupejut.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hamilton+beach+easy+reach+toaster+oven+owner%27s+manual
    • 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_off0000d1a8.bin
bbc399b606bf3386489d7a2f0e351cd238e2b1ed5f8b449225246c653a190bda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A8 11024 bytes
font_01_sfnt_off0000eb2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 16792 bytes
font_02_sfnt_off0001033f.bin
56200f8a7d441c43e1a95929c27af14b74bb42c1bbb330e35af43c31a8a2f524		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 16800 bytes

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