Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b45947e7fcc1254…

MALICIOUS

PDF

71.3 KB Created: 2021-09-30 18:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca174f07616ca747abc497e1d0806a43 SHA-1: 35a2800edbc05588ccf0d96558cf8625d375b698 SHA-256: 9b45947e7fcc12547e5757e62f7b32aed1c617847ec34219f502b6384fabdf72
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The sample also exhibits characteristics of a link farm, with numerous distinct hosts pointing to PDF files, suggesting a broad distribution effort likely aimed at phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://police8coop.com/UserFiles/file/21878103626.pdf In PDF document text
    • https://rsebolivia.org/userfiles/file/32967723956.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/gagogikatujowi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b155f2da3---lisubexajixuxa.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/juxigorejobejidujam.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/nalifuvajuromezumuxu.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/tolebavanagovoruzavavu.pdfIn PDF document text
    • https://forumsevens.com/images/file/75497417162.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/75137438475.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/8184434598.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/45165808016.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109271015011901.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/pexaf.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/galitoligivivudiverer.pdfIn PDF document text
    • https://songhongresort.com/img/files/95192296597.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/luderoze.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16308733862336.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/wadifuzumetidorekotoja.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/80651148895.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/bexapesilipifalewof.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210910030602.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/86939553064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+2.1+eclairPDF 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_off0000b399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAB 17636 bytes
SHA-256: 9ffb23c6735e81571c3a031b0d8457728d230beb9c89b869eacdf0bdff49c35f
font_02_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 10316 bytes
SHA-256: d70297fa1688a461b0e1e9f67b197c0df034d55239a79a6d4a8e43dcf6850890

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