Malicious PDF — malware analysis report

Static analysis result for SHA-256 f106b342d4265357…

MALICIOUS

PDF

73.5 KB Created: 2021-09-11 07:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3885763e696c45a0d0fc73c01687e1ee SHA-1: 8bcfc6db368f7eaba1c8cb889485ac2209fa5777 SHA-256: f106b342d42653578ec6ef4ba61ccb31165a682961816d1074e2e87d88d27342
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

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 https://synerhu.ru/uplcv?utm_term=how+to+print+pdf+from+android PDF link annotation
    • http://bulk-supplies.com/userfiles/file/mimijewi.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/34169473481.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/nemaduberakepe.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/fisarajisewe.pdfIn PDF document text
    • https://mavibusiness.it/file/35537417062.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/5761097451.pdfIn PDF document text
    • http://trubaopt.ru/content/file/10157492146.pdfIn PDF document text
    • http://www.520amis.com/upload/files/63006098449.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/tewelinozuladib.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/rimuxozezaza.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/92715057769.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/newutivozidelabire.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/navovivogok.pdfIn PDF document text
    • http://baoveantam.org/upload/files/tobutik.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/6rjsi7csv77kl8fbm7endi00ph/tipikejikedudumefunide.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090412311173499.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/32438369851.pdfIn PDF document text
    • http://frchem.cn/upload/files/79551945799.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/fowetevugunizimel.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/97918694059.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/rujufamo.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/32246166406.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_off0000bd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2E 16948 bytes
SHA-256: 5d5335709d5df259cd5c235879f7adee962907828344177bfa3cd58fcb81f73e
font_01_sfnt_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 10392 bytes
SHA-256: df200e01fee562fd5a9ee07d1bc57a396db4368faea5179570e0df84fe91a100
font_02_sfnt_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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