Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b6bfb29de8d7b9…

MALICIOUS

PDF

89.0 KB Created: 2021-09-20 07:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e3db1750d8defda0f51c1abd2304c086 SHA-1: 93b15590dafd507b1a477c43bc8266c3502c9050 SHA-256: 49b6bfb29de8d7b9da6ee38204972acc9eed1c0a00bef750977f991438ece696
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to direct users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is not a legitimate document but rather a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=after+we+collided+watch+full+movie+for+free PDF link annotation
    • http://f-kcc.jp/user_data/userfiles/files/mabojuxo.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a3791daf8c52c03b3317bf0549680310/29471821543.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/ponoladep.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/50860121557.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/vonado.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/70636978401.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/50800124479.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/zasisaninidagob.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210918105623.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/xatenezinewuzilofakiwi.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/34147571982.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/9651318903.pdfIn PDF document text
    • http://kgmda.com/upload/files/26794155284.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210910215331_ejzxxz.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/xitutifepexagep.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/64138294991.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/23414514010.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/ripoja.pdfIn PDF document text
    • http://tradotel-riviera.com/file/fojepi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ed12d937b---welomekuzuledofibewetola.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/jawibabexidimimozez.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/mabegotevixezore.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/75447225082.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/vapodaf.pdfIn PDF document text
    • 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_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 17596 bytes
SHA-256: 00b4ef71ee11dbdca2e8337d1e573261634644800af5e826d9f84769606d5f40
font_02_sfnt_off00013dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAE 10704 bytes
SHA-256: 107d76aa13be75ef53b5300fdcee394483ffa930ffeac56a8c9451622971fd72

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