Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70f5c45705c0990…

MALICIOUS

PDF

73.6 KB Created: 2021-09-13 22:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6c4a62a8b018abf2949faaa9329a014b SHA-1: ff3931ed471409c89657a3ab667462a31373d80d SHA-256: f70f5c45705c0990a61ba14b11806479148a1c47df79025e839124d20eee1ee2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, including those flagged as a link farm, strongly indicates a malicious intent to redirect users or deliver further malicious content. The ML classifier and ClamAV detection further support this assessment, pointing towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://joeun-it.com/userData/board/file/963705286.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613e50bd9a33d---14851967485.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/mosexoxubojokigaxasu.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/jafozu.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/11902124981.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090211563473499.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210905_76FC87D9D0B34902.pdfIn PDF document text
    • https://pecsikult.hu/files/file/sevatijog.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/zuditasufuwijotigazasofoz.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/suxotag.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/92231338785.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/43228871714.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/45131350722.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/26579917683.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/57640825028.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/39053517276.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/76760833302.pdfIn PDF document text
    • https://gencatakan.com/upload/file/wineso.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/lajijebenox.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/68403514677.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/73031570775.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/77083111963.pdfIn PDF document text
    • http://ranchobg.com/img/file/nufusukaz.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/18092010731.pdfIn PDF document text
    • http://espokebar.com/uploads/files/61074942074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=watchseries+hd+tvPDF 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_off0000be20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 17080 bytes
SHA-256: 42714a861d31b0ad05e719572a0ee959fb0d0532995354ae9e80ebf2b8f9e624
font_02_sfnt_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 10256 bytes
SHA-256: d278492a5677529bd78f93741838bcb08460315628b1b39ba69689616611708e