Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4eba4277c08e6ff…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 13:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 065128eaeb5491fba8df85ceea55effa SHA-1: 9f339e06ae2bc66d9d7ba6a4a33e06c5a2926e20 SHA-256: b4eba4277c08e6ff82889ec1d1de1806d0bd3d4f6590f13f9fbe8e73d4be3af0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common attack pattern for delivering malicious content or redirecting users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=zack+snyder+cut+justice+league PDF link annotation
    • http://straub-online.ch/userfiles/files/51583285048.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/36870089847.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/65143171649.pdfIn PDF document text
    • https://renetravel.ro/images/files/jubagizejevakugiwumexoxe.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/ligekom.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/zevafelikiz.pdfIn PDF document text
    • https://cncunse.com/d/files/51766440665.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/beferubumixepuxuni.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a0506e431c43e2cabafaaa995733e77f/3996406958.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/47143283908.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/najelinitolap.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/rijozubekajonelosilijixaj.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210916095803.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/56846547354.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/ratopunorozatezojubi.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/50107696085.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/35131109786.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161319e43d0d43---rejamowoxinudowemeluzo.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/46943601664.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/xolizuvizuk.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/digixugokixi.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/70590551984.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/47742932026.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_off0000db31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 17312 bytes
SHA-256: 8d89425439e4b20638e8ff744839d34ecb9a8f64a315077756299c31087a1787
font_02_sfnt_off00011faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 10824 bytes
SHA-256: 71670bd8cf88fcf5fa582f91399d6aaaf6fd17271f44b1f790973ab542313005

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