Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd4269b4417cc7d…

MALICIOUS

PDF

88.3 KB Created: 2021-09-13 18:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 232f6cdc3b0de320cd0c140e46db800d SHA-1: 1f92ccb4eb3aaa629875c11b1c43522c05da32ef SHA-256: 5cd4269b4417cc7dfe52d8e0053136030620b6f568bba8cb1b9c265d0b9d7c81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

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 http://futureinfashion.com/ckfinder/userfiles/files/27870277723.pdf In PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210910050730.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/29205c7d8144ccb6e5f224002fdaa84d/82641864463.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/texemogutufulupesesukod.pdfIn PDF document text
    • http://entrackintl.com/uploads/33543487778.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/laxakupojolonufilo.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/52402375583.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/tosut.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/sagatasexefugodosajegux.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/92039519103.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/38293899334.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/82464969876.pdfIn PDF document text
    • https://curvy.tw/upload/files/58287562389.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/53201536381.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/pazenewagonokojikopes.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/245b4a858c670e77afd0d6d4c5ec0cbd/divopilu.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mudejitakebepapixu.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/befizenoja.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/35087704006.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/28413851557.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/51713224241.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/misage.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/8243991455.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/34245870053.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/bewugetosatebareroxijum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=shareit+pc+to+androidPDF 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_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 18532 bytes
SHA-256: babf514c70de34022c48af3a39df4321ee28bbecae636af0b7197241274525e3
font_02_sfnt_off00013bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBC 10472 bytes
SHA-256: 6ab0827ed08e434264dedf5f89ad4ebfc3c467bf4295c373c04bbb1e7b2215cd