Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcff65d0eabc72e0…

MALICIOUS

PDF

78.3 KB Created: 2021-09-11 23:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2937e1695e9cd09bc8ab3284827956c SHA-1: 7e1607de7d9cadebcc8745b5fb6e03de4a470cb9 SHA-256: dcff65d0eabc72e09725be3bf12825e5c11f8f6ab6bc08b882c9f8d509288d56
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of external links, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sedaciesupravy.sk/media/file/46642195436.pdf In PDF document text
    • https://adci.vn/data/upload/file/82862523795.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/lajejuf.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/vavanowikixabud.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/bapifexexizomevuluxol.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/17372520311.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/25673241208.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/fixitelopobopuwadeterire.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/52225124876.pdfIn PDF document text
    • http://falerisztika.hu/tmp/30646990415.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/92972693033.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/85582488666.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/4198515542.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210907051121.pdfIn PDF document text
    • http://air-ned.com/uploads/files/nudobusowukovor.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/51274970234.pdfIn PDF document text
    • https://jobtiara.com/files/files/juvot.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/17751164484.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/69ff07985d560e64cf1429a013715536/20584952548.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16136162103f54---pumunugukomuwujaxiselapa.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/11290621197.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/soxogiravemuwarutijedes.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/43042857148.pdfIn PDF document text
    • http://pedraferro.com/files/files/53940953246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=parental+monitoring+software+for+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_off0000cbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFE 10784 bytes
SHA-256: 4d382b03ee495c0e12cc189099ba31f334661651b5d0367a43d2ad46ff9ebf97
font_01_sfnt_off0000e4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 17788 bytes
SHA-256: ed359c4ed4fde0b9398c241a3b4493dc52da4f3b2b432224818af53718f5e714

Open this report in the interactive analyzer, or submit your own file for analysis.