Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16e35bfd28adcb5…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 02:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9546b716c6f13982c971fa56b9b65c5e SHA-1: 439602d007fd95198012d5b7164b3166ad367c7b SHA-256: c16e35bfd28adcb5f59450e3af0c4ff344a33894f1a5bcddf248c740ece9c5d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting an attempt to distribute malicious content or phish for credentials. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate effort to obscure the final malicious destination through multiple redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://philabc.ru/uplcv?utm_term=pacote+de+atualiza%C3%A7%C3%A3o+android PDF link annotation
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/hf7ege53rcgdc2pc76dg8t3t6n/5574198460.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/50866337773.pdfIn PDF document text
    • http://mq-water.net/upload/87363541750.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/rarejinezafedagibobave.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/21895015703.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/masizoxe.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/zonodutezuxojafesogiselu.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f58021dd41---zamazixotapefubavaxawalij.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fepizoba.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/vamigutin.pdfIn PDF document text
    • http://canadianrockies.info/files/file/50867211272.pdfIn PDF document text
    • http://cissi.it/userfiles/files/bimakipime.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47120670396.pdfIn PDF document text
    • http://e-sportis.com/images/upload/36403329492.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/95515270503.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/25080149095.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/52304162726.pdfIn PDF document text
    • https://fasaac.org/temp/files/wanexagidexime.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/47983711409.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210902_1DD8E005304395C3.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/gajazudajafesufukuf.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/pelutelever.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_off0000d627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD627 19924 bytes
SHA-256: 00f9479d68fbd3bbf01da935d66098d9da8bac52544a85f5acc5cfd388d7d5f7
font_01_sfnt_off00010820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10820 10820 bytes
SHA-256: c4c997b9b4f9a4009001d1ee07ed60dbcedad35ee72cf0c69798ddcf5cb371b3
font_02_sfnt_off0001207d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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