Malicious PDF — malware analysis report

Static analysis result for SHA-256 0799734c12ac88f3…

MALICIOUS

PDF

72.5 KB Created: 2021-10-01 00:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e938da9724d4757d1a9cbfb3a8073ca SHA-1: 8bc395ec9ff94e6988d58043367c5585c5bef7aa SHA-256: 0799734c12ac88f3fb7ccefc5f973521b0aee34b4d5bc1c8719980d5fa8c5398
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, reinforcing the malicious intent. No scripts were extracted, but the structure and heuristics point towards a phishing or malware distribution campaign.

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://gizaviation.com/uploads/files/wemodeporixogirukepisax.pdf
    • https://pomacanthe-art.fr/imagebeforeafter/files/22925117794.pdf
    • http://sallytour.com/FileData/ckfinder/files/20210904_EFA9C2BEC87B3DC8.pdf
    • https://grandegroup.net/files/zigeridotefagagirixufis.pdf
    • http://gianphoiduyloimodel.com/Images_upload/files/panolosozara.pdf
    • http://nenkin-t.com/upload_img/ck/files/7619411546.pdf
    • http://rajskiewakacje.pl/userfiles/file/13174072959.pdf
    • https://nnt52.ru/userfiles/file/webukepuwijuvoxigutifi.pdf
    • http://lovesushiscv.com/uploads/files/82670598250.pdf
    • http://cafesezony.ru/fck_editor_files/files/85228300466.pdf
    • https://bonekarusa.com/contents/files/92740962725.pdf
    • https://larioenergy.net/uploads/file/xujaxutulesizomaxunutolun.pdf
    • http://physio-praxismitte.de/userfiles/zupejag.pdf
    • http://facyt.com.ar/ckfinder/userfiles/files/44872294682.pdf
    • http://pincailight.com/zk/UploadFile/file/2021091408054073499.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/367247454cab6525aed73a3fbd3bd91b/38829161320.pdf
    • http://brukbet.com/user_images/file/43871062205.pdf
    • http://sarkar.ie/userfiles/file/nataxusivusisezoza.pdf
    • http://www.cenlafilm.com/siteuploads/editorimg/file/33923434811.pdf
    • https://www.meditech.cz/ckfinder/userfiles/files/75786282275.pdf
    • http://eastindiaspray.com/suvra/eastindia_spray/files/54206863818.pdf
    • https://tarzminder.com/resimler/files/27413898803.pdf
    • http://school19-zav.ru/userfiles/file/lapiputakelumakoza.pdf
    • https://www.zochrot.org/ckfinder/userfiles/files/24722344954.pdf
    • http://www.galiantsolutions.com/emailimages/file/44883091439.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=teclado+iphone+para+android+con+emoji
    • 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_off0000b6ec.bin
e25728d9390971e1769392967358a1d1e42fda03ba85c75ef4a96c73142f2059		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EC 17572 bytes
font_01_sfnt_off0000e430.bin
757d9fcd96148ffc29356bc36c6fe371b01803767467d947a522fbfa92d47356		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 10608 bytes
font_02_sfnt_off0000fc20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 16792 bytes

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