Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b3ea9f0aa0b0e5…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 10:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e3ffec98d68a3f0b94e2c3b9e0682ec SHA-1: c8b463158e1aef8a144b7aeed30320e3f7a01804 SHA-256: d4b3ea9f0aa0b0e5f822183e127f3b7ac0ae39ff6915effc233672830cf78bad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely delivered via spearphishing, that aims to redirect users to potentially harmful websites.

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://oniceh.ru/uplcv?utm_term=smart+cricket+live+score+app
    • http://ministryofrum.com/memlogos/file/tusameweb.pdf
    • https://epponline.com/mentorfinancial/page_images/file/4415623718.pdf
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/texare.pdf
    • http://gld-lining.com/user_img/files/gupugeno.pdf
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/65274174786.pdf
    • https://alves.bg/ckfinder/userfiles/files/ramugokefabozetoperofer.pdf
    • https://ambient-interier.cz/files/files/xidakosunobimozasojo.pdf
    • http://zovsh.com/Uploadfiles/files/21615329702.pdf
    • http://c2r-auto.com/uploadfiles/file/2021091000584073499.pdf
    • http://x-site.by/upload/editor/files/9961352968.pdf
    • http://madurastones.com/userfiles/file/37600625647.pdf
    • http://aloeverajuice.cz/files/file/32725350754.pdf
    • http://iphysiology.ru/upload/91531880324.pdf
    • http://zzquansu.cn/d/files/fenawafifos.pdf
    • https://majubesar.info/contents/files/29567294265.pdf
    • https://balarampurblock.in/ckfinder/userfiles/files/vozuzuvo.pdf
    • http://goforthegreengolfpools.com/userfiles/file/nizoxoneruxukujo.pdf
    • http://www.mustwalge.ee/data/content/files/soxurefizun.pdf
    • http://daoltrading.com/userData/board/file/jinisegi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c212bc8702---25523433566.pdf
    • http://oroblupiscine.it/userfiles/files/patuvutusawadijimisum.pdf
    • http://norrlandet.se/userfiles/file/pesuwepepogoj.pdf
    • http://longtra.vn/userfiles/file/10725253809.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_off0000dfb8.bin
5a71d1407586d119a4ff71697f06ec53b35c99c7d2d7c71431ba09f7ccd896c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB8 10664 bytes
font_01_sfnt_off0000f82b.bin
4aec888e006dbe4cd1d22f36cbc3c77961a906c22a5a4714a673c670def52af5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 17604 bytes
font_02_sfnt_off00012605.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12605 16792 bytes

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