Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57478578eea34da…

MALICIOUS

PDF

80.6 KB Created: 2021-10-06 15:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6cd7f9177d7abecddfca7ed74ef3a459 SHA-1: 6cb0d8a09d7bdc170d0a7f7359201e2db5c99020 SHA-256: a57478578eea34da35b4aeafb17101f08f0b4395d9e3c43c33350b276c6f2104
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of JavaScript to redirect users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=best+claymation+christmas+movies PDF link annotation
    • http://fredericjean.net/oplusco/file/xisit.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/xakesebuzerube.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/30087432792.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/24485577862.pdfIn PDF document text
    • http://pasaru.com/upload/files/848283645.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/vowisoviladife.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/jabogolemov.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/31467204018.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/76556908375.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/31577008027.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/1491686712.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/pekejakugoxafizevuwe.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa08634a2---84942778275.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/weguvidogilukorufuz.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/4e317450716aea1ffc9ef061a664f849/witikidutowukuw.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/10739609445.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/92538873374.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/69083926258.pdfIn PDF document text
    • http://rs-entp.com/upload/file/56508723263.pdfIn PDF document text
    • http://kes.org/upload/editor/files/45742687330.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/33871392713.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/baguw.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/mowixonamiwotubiz.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_off0000d42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42D 10728 bytes
SHA-256: 16ad70dc741f90b7c4fdd9a412cae45a3f506b7ad2650d5af5904f33790fb594
font_01_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 18888 bytes
SHA-256: ea9052351b1c74fe4a1e317728bcf816ea231890385cafa05ab785031340bd74
font_02_sfnt_off00011d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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