Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fd89bb6c216568…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 23:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b40f7ef4dbe43e54c8910302195618c2 SHA-1: 457d048cac5a80b39bcfaa65ca06a437a91a75d8 SHA-256: 66fd89bb6c21656843f27dd72aa7a0016435766e03b1d7e6ccee78b939eedc7c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=play+super+mario+crossover PDF link annotation
    • https://fullhousetourism.com/UploadFiles/file/20210911031935193.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/nunurimavosisotufuput.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202194819511959.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/2467186154.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/bokasopafegozil.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/gidilatajunasene.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/laregidip.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/jegenosijabet.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/57496724077.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/12605551127.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/mudajujivepawo.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/bimajozulakoguzonuvogefer.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210914110138356.pdfIn PDF document text
    • https://isleo.com/i_photos/file/502287740.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/soraninofopifaxubi.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/55214542894.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/97823156155.pdfIn PDF document text
    • http://cascad-trans.ru/files/kaluni.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/jutokapiwirutek.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/regedefawiserixapovekozab.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/nosezijibunup.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145841c38348---pofoxuvagixovepig.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/bujususugefazobavakafiji.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/nepulabem.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_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 10616 bytes
SHA-256: dcca294bf0c9f77e014098e88424c0d05f479243d5cffcd55b02290757cac403
font_01_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 18152 bytes
SHA-256: 858d72ca3deff5880d551030b740c7c4eca449212ab30cfa0d49f66e8e7721b6
font_02_sfnt_off000127f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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