Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdb8d696e36096c…

MALICIOUS

PDF

83.9 KB Created: 2021-10-13 19:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c304eef5011fb21a94f120edc7f6acd1 SHA-1: 3eea1e271479c2a0f26501c2af388a7ef7f866cd SHA-256: 3fdb8d696e36096ccbf313bdf22a7388d244c2811b854c986a985af35efa040c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to obscure the final destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of many external URIs suggests the primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=south+african+butcher+near+me
    • https://mywayrtk.com/userfiles/file/7785385911.pdf
    • http://pincesorvarshop.hu/editor_up/87263034621.pdf
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/30664096649.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5316df089---87382632323.pdf
    • https://kccegis.com/upfiles/content/file/20210922204814.pdf
    • http://marikitaberbagi.com/userfiles/file/papidef.pdf
    • https://tepatsasaran.com/contents/files/31402281746.pdf
    • https://kvzriu.org/images/file/3069603611.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/29198079205.pdf
    • https://tahubunting1.com/contents/files/70511330771.pdf
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/jalub.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/fogurudiripilukores.pdf
    • http://yjeverspeed.com/userfiles/file/57844436311.pdf
    • https://fundacjanadzieja.com/images/wyswig_images/file/xisitumufirudoxirakum.pdf
    • http://yuhao-tech.com/userfiles/file/56115765021.pdf
    • http://eternaseguros.net/files/files/23097875775.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/93e32b9dd2b60c852808ebe30813f8ac/6504600536.pdf
    • http://jjkxmy.com/upload/files/202109191101117618.pdf
    • http://ave-france.com/pics/files/61657950690.pdf
    • http://ridendo.cz/files/file/kojojas.pdf
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1632585412.pdf
    • http://adaviestransportltd.com/userfiles/file/bomekifi.pdf
    • https://investincarpathians.eu/app/webroot/media/files/17335690995.pdf
    • http://hzxgdz.com/images/upload/File/sabirab.pdf
    • https://teamcode.net/upload/files/60968125954.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_off0000da48.bin
c5c1c43ca7d6207a7dae7070a289946724a2ad89572989c0a0c08baf380d03b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 20400 bytes
font_01_sfnt_off00011082.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11082 16792 bytes
font_02_sfnt_off00012899.bin
ee68fd0a6dab3f36c699c514862188522c5b04c5b4dddca3bc71839f0b679e5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12899 10704 bytes