Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d5cb93eefb8290…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 22:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0dc8428bcf797a9b9c3667d80466e3a1 SHA-1: 4a5c65a3509c102fa881a82d730bef9e3963369e SHA-256: 72d5cb93eefb82907eca22c058e30ec2b725b0bd5d3cffbc017ede12654e4b34
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true malicious intent by distributing links across many domains. The ML classifier and ClamAV detection strongly suggest malicious content, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://vitalchurchesinstitute.com/files/file/jeradeweber.pdf In PDF document text
    • http://csp.hu/editor_up/56726110441.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/kumilibonomug.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/vinijozos.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/luvugajuwobiwabobojuvimi.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/83606723196.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/gekax.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305bcd56aad---veduvosevizodowu.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/96937709946.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/zipewoneduvowunepo.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72854028340.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4c2eb407---25488473494.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/gevanuzodikexufezaz.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/mufizanuvesede.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/59489964447.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/93670895921.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/zumafexiparabenosekasaw.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/pijubawitadumozipowafaf.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/rabomipufeboju.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/20135731274.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/zelalulanimupanofudira.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/bamuvoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mobistealth+mod+apk+downloadPDF 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_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 10868 bytes
SHA-256: 2bc4b5998211b4e4bd11eb0a7dac8a883f6c3c8a0eb8419c901b2374397263d0
font_01_sfnt_off0000ed8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 17472 bytes
SHA-256: 2a3e6ec4df953c789d01e753fb480ad2bd61e32ee88cc5679b0aa80524a2a3f7

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