Malicious PDF — malware analysis report

Static analysis result for SHA-256 981a58f89f63eb61…

MALICIOUS

PDF

74.7 KB Created: 2021-09-12 19:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb1af96a7d7462eabbf124108e42887a SHA-1: 865c637006713a194f91900ffa3a11e35dfbf15f SHA-256: 981a58f89f63eb614f5500a3ef93aa4cad77a0762a741b44976275ab67770fdc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external links, many pointing to domains that appear to be part of a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://beysukonaklari.com/ckfinder/userfiles/files/30281050715.pdf In PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/lamufaroxeja.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/60794157761.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/37295633615.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/77645370103.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/97617458881.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210902120047_1970994525.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210910/file/1631240287.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/xamulusanuji.pdfIn PDF document text
    • https://regenerateacademy.com/file/biwalaxubuk.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/losigof.pdfIn PDF document text
    • http://accronline.com/userfiles/file/64490518234.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/mewemepubusesepifono.pdfIn PDF document text
    • http://aa-nusd.jp/kugimuvoboxu.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/jupofewi.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/naperur.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/rusagiwejovepijapokov.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/37045526492.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/vafilugukurixatijenixe.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/befiteraxidikosenudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=arabic+prayer+before+eatingPDF 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_off0000b999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB999 10676 bytes
SHA-256: d6f9cd398e4a1b22412bdfcb9584bd28bce0de9af148d4ac97c6da35f01b3a87
font_01_sfnt_off0000d217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 19560 bytes
SHA-256: 6a69ea483555efe532cc88a840f0f126a04cdd1145d955653f34c2f6470aef27

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