Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a681eedeaf04fd5…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 10:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1100e7fa031da7595e3ffd205083de1e SHA-1: 6bf3f6bfdca8081b8c8883741bbd412a915ff98d SHA-256: 0a681eedeaf04fd574635eca467425e136894b29f27766b776c8dc82ea943f9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. The embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a tactic to obscure malicious destinations by using a large number of distinct, disposable hosts. The document body, though heavily obfuscated, suggests it is part of a lure related to software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lukinserv.hu/file/14411090881.pdf In PDF document text
    • http://iltorg.ru/upload/file/nodufojuzipisif.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/64772468056.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/96801766566.pdfIn PDF document text
    • http://vanhacollection.com/images/files/11324238155.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/77225289133.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/88a268bb35bc20202d6352f128a43343/31343901179.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/tobuwutuvusemanifetivix.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/19479383202.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/8785985657.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/jesijuzafopo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613da9390c98f---97827290372.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/98087788950.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/34273387437.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/xidosisinogepol.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/sabelalevukodutarus.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/85958430029.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/56394074819.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/titevofapejikokodivop.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/zajapekoralolusot.pdfIn PDF document text
    • http://artepcb.com/upload/files/serizevodabudisoma.pdfIn PDF document text
    • http://jiab.net/userData/board/file/dotipodib.pdfIn PDF document text
    • http://generoussecurity.com/uploads/20668475175.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/15393871993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=windows+10+download+crack+full+versionPDF link annotation
    • 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_off0000d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 16728 bytes
SHA-256: 779fac7cff681773562ceee5960bfa6786bb77e6b1098caea86bef0d0251dc21
font_02_sfnt_off00011972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11972 10884 bytes
SHA-256: 50d7cff176e5ebf6c4997e09257546af9ac215ec45db14d9d8ea85966f93f4ea

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