Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e426985b4b9bed…

MALICIOUS

PDF

80.2 KB Created: 2021-09-24 11:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ed3ce2cb698e6c267312cec4a246a36 SHA-1: 1b4ac702d473e143456807c37b19b8d66c01cdb4 SHA-256: d7e426985b4b9beda15981554337e5b38e77a810c6aff8a21c65cd3ba5e3c2c7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs, many of which point to disposable hosting and appear to be part of a link farm designed to obscure the ultimate destination. The document body is heavily obfuscated and unreadable, but the presence of numerous links suggests an attempt to redirect the user to a malicious site or download. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.rpv-drachten.nl/files/file/wixofamudizoza.pdf
    • http://way-of-spirit.ru/upload/file/99244320949.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135e729b19f4---70744827686.pdf
    • http://interwork.sk/userfiles/file/dimewovok.pdf
    • http://watdoenwevandaag.nl/upload/zisegokazedezuwirefis.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614be3b70ae87---buwalilige.pdf
    • http://viquadro.com/userfiles/files/59154458276.pdf
    • http://vanxuantravel.com/upload/files/75026985242.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nibarisinixubirapixofa.pdf
    • https://bhsbeacon.com/FCKeditor/file/81014521059.pdf
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210920_FE60B557E2DCC618.pdf
    • https://hongmao.tw/uploads/files/202109221504244473.pdf
    • http://100gastro.cz/soubory/files/liwapax.pdf
    • https://zabulgaria.org/userfiles/file/wanipator.pdf
    • http://ulsantour.com/FileData/ckfinder/files/20210903_D9D765228E06E35A.pdf
    • http://enovosti.info/ckfinder/userfiles/files/56987724074.pdf
    • https://araprinter.com/ckfinder/userfiles/files/66745173504.pdf
    • http://flyingfish-stay.com/userfiles/file/tomagisopusafevi.pdf
    • http://drukarnia-warszawa.pl/pliki/file/zimuzimovidupulajakalam.pdf
    • http://ufcnagykanizsa.hu/userfiles/file/dapotidiwudejavub.pdf
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/88855061999.pdf
    • http://jinistudy.com/_UploadFile/Images/file/7387172324.pdf
    • https://nls.vn/upload/files/88065534989.pdf
    • http://smcertificationservices.com/userfiles/files/92042184254.pdf
    • http://image.dlib.vn/libedu/news/bvu/20210920/file/91787291442.pdf
    • https://www.utn.ac.cr/sites/default/files/files/31565089738.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=transfer+app+via+bluetooth
    • 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_off0000d6aa.bin
2cdfacff49ff35f0848c03004ee9a0f783e34af436877d725617fa656af8033b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AA 10724 bytes
font_01_sfnt_off0000ef04.bin
fa1e29f2fdf65a0056c43be88fe90d5e83d7deb21bd17b847af7030e3fc3b385		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 16900 bytes
font_02_sfnt_off00011acf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACF 16792 bytes

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