Malicious PDF — malware analysis report

Static analysis result for SHA-256 610d541501ade1a1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 11:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d938b1ce07304e7012ca2ff5aef1669f SHA-1: af903828bf943defab55b3d41ee10611123bb825 SHA-256: 610d541501ade1a1b2112cb64e127529b6af24fec3f1bee4cbf1c6321ecf2402
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript (T1059.007) indicates an attempt to execute code within the PDF viewer, likely to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chiaranannini.com/userfiles/files/95321872591.pdf In PDF document text
    • http://npi-management.fr/ressource/site-image/files/3430017806.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/60257415692.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/guvunud.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/53758287813.pdfIn PDF document text
    • http://www.bash.cl/media/file/pirixuninawuzobudazep.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/fipafeworakodemavu.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/197fe6dcf6c82076c5bc8a9166bc6023/70231624513.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/xoxenuwizuvinifimuninobaz.pdfIn PDF document text
    • https://olterus.net/contents/files/novusakezugapi.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210902015954.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m5r808uceqsokob45d1q14v217/vokurewimirogulodufijubix.pdfIn PDF document text
    • http://domuran.pl/files/file/vekumizigelojipobupi.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/bokusufuk.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/wawonevugutabus.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/68950763654.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/nafevofunokojojazexam.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/pamedetonunivevulesagop.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/85489169135.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/78990674345.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/79661521025.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/73446609585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=play+store+locationPDF 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_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 10340 bytes
SHA-256: 756006eff04670eafe02bfc12e4ae0aefbde26d2a4488f9c97fcd47c25ab0e78
font_01_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 17780 bytes
SHA-256: 161bae04dc1e8df0d6a6d301e40d79ed96ba9f2f8f5e9f6163f31ccb005a8cd4
font_02_sfnt_off00012441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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