Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ae545c70eb2dab4…

MALICIOUS

PDF

77.9 KB Created: 2021-09-19 05:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 684fa7b61018b06cb8ba85034665375c SHA-1: 2cf344e085d3d90901ae452b4e0081cf1eb6ed43 SHA-256: 2ae545c70eb2dab44d763a701ef32047616080adcef165aa4fcce88125baf28d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection and a high ML score. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially malicious websites. The presence of many disposable links on disposable hosting further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=how+to+turn+a+pdf+90+degrees PDF link annotation
    • https://mkontakt.com/dat/file/pelumezituwuwirewefo.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/lemovofutavetasat.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/werubiwuguposejedet.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/84671099400.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/53876149418.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/jufidanu.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/jorekabavilaz.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/12465134586.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/63211778215.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/33231536912.pdfIn PDF document text
    • https://xlquality.com/userfiles/file/purodokavikexiwerikebizu.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/digogutug.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/purawevubamuxediliju.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/44862245811.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jozewivorokosuzinikezu.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/zopidipewebiti.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/gazisetapaxetobe.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/bakimulimaj.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/bilagudatemugulom.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/lijudowudagopavejojate.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/84038778709.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/8327638458.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/70993448995.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_off0000c87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE096 11004 bytes
SHA-256: 36d87f9a19e5920c62e368fda1b8844c0b10326e2ff1343df7e98de8f1097180
font_02_sfnt_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 18244 bytes
SHA-256: 6b6b0acc75c093d50fc1438e2aa795ad10dd0aba8a2dd2c19b4e4e311337d627

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