Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06ef398d05f10eb…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 12:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6c4f0e45fa5bc53ece85ba9c17cbc6eb SHA-1: 5090cb8fc50852a744e13bdeee64a0187891afd8 SHA-256: c06ef398d05f10eb3cd920a96369b02f9cae46933c687cf62bf2ab8380dfe1b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, with a significant heuristic indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://infrive.ru/uplcv?utm_term=disable+unknown+sources PDF link annotation
    • http://szamosiszerviz.hu/feltoltott/files/kulezifanugepanonipodar.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e16e894d4e---segepo.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/15244322886.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/vikodibo.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/winisaxegosujexipetemubu.pdfIn PDF document text
    • http://ecole.ru/text/images/file/46213986087.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/bogikonugefesuxatexonu.pdfIn PDF document text
    • http://shopabrang.com/images/files/29547313150.pdfIn PDF document text
    • http://vaynhe.com/upload/files/73198130264.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/titaxixazofonujamum.pdfIn PDF document text
    • https://kueapem.com/contents/files/49027959931.pdfIn PDF document text
    • http://adveotec.com/img/file/tupisofutam.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/df57c058142afc34224fef4250ec7986/53724061938.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/xiluwowuxobujiveva.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/gewagatuwakugotep.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/rilegabukil.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/kigutemisomonejekasubivob.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/ponumasevepi.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/64696997229.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/36872120854.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/68159092891.pdfIn PDF document text
    • http://africareview.in/userfiles/file/89972849333.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/41036428096.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109081834156812.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/67187470186.pdfIn PDF document text
    • https://lordoptika.hu/files/files/vubojosawogifutizopumup.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_off0000d337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD337 17836 bytes
SHA-256: 09a990ee52cbd3b20409f27a13024ed205b20a5e453dbd4d7a0a63963efe1209
font_01_sfnt_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 10544 bytes
SHA-256: c26f1752f301e1c763048c3eabfde7635aaf9a30e3b65e6b153d1dab2514a1d5
font_02_sfnt_off000119da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1