Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6f37865aa20a2c…

MALICIOUS

PDF

69.6 KB Created: 2021-09-22 10:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8dc57ca13cb7e075a954766f10490156 SHA-1: 6bf2d2b6f4ccd3531a9295af901c10a562a28256 SHA-256: 7e6f37865aa20a2c65fab7d40b6b65094c24aaca4619647f72e6c88e244d87c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to execute the embedded JavaScript. The presence of a link farm on disposable hosting further supports a phishing or malware delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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 https://yodobashi-church.com/31434035246.pdf In PDF document text
    • http://hidropro.hu/upload/radoxuxeje.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/13541258919.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/mivajasaxov.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/fotoboduwarepaxozabu.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/fasufaxefebe.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/31775503012.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/depuwewajejetidenuf.pdfIn PDF document text
    • http://usmleworkout.com/files/file/wikodizaxafidovilu.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/ganudota.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210922_152353.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/edcb47eeab1964e1a8368a17b1606b22/83885898379.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/93601495753.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/selagosurenebabivejob.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/28182117430.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/31478532953.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210916215252.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/zamiwimegox.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/wexuli.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ad8e80bcc---wejarusevumotefixelosaja.pdfIn PDF document text
    • http://maksimetall.ru/files/60610894762.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090604544473499.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/gefusinojokutejimakak.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/wudobege.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/2246603721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=12th+biology+textbookPDF 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_off0000b175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC987 15544 bytes
SHA-256: 93fe9f2ebb6248f253e07e70e3bd5d426f650704bab5c0c139c12e4fed276c9e
font_02_sfnt_off0000f115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF115 10376 bytes
SHA-256: c42cc28f9743fe148a7500b87d78d8b2f912377d31ee4a0ac1351748c57a7ab9