Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1aa5869ace7b94b…

MALICIOUS

PDF

79.4 KB Created: 2021-10-12 21:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6490048e688b81e16b4003092e19b048 SHA-1: f1591794fe665c84c4cf7e24de86754bcc494f81 SHA-256: c1aa5869ace7b94b2bab2ae2e3721be87593adeaa8f19c62c1728bb16b2a2cf8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a large number of links on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archiw.gbpopatowiec.pl/img/upload/files/sokawanuvunuzal.pdf In PDF document text
    • http://changjiujz.com/uploads/files/202109241807093060.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/nujejomimezubolobutilogu.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/lasojirodilekedazivivet.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/mitorovutodis.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/reseg.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/86059532627.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/24980807159.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/90284619054.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615392bc470a9---zumevugifonij.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/butomekoja.pdfIn PDF document text
    • http://kaies.net/upfiles/file/94426526588.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/kubupumuwuwipilexasa.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/41170458166.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/97825343772.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56644268128.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/19400081867.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/9897177450.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/gazatoz.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/48991257184.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/55585903664.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/BcFPVxLj4jw/uplcv?utm_term=boat+on+water+drawingPDF 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_off0000d4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 10348 bytes
SHA-256: c3b4820de76bd256581f3999bbc85913afbc28779f9e3607e50a39bb08ee9ddb
font_01_sfnt_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 17300 bytes
SHA-256: 34afb7759012d0ea59f9040abc0d53bb2526f12adec10874a40891f2308d86e4
font_02_sfnt_off00011818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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