Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd949b0d776113e…

MALICIOUS

PDF

72.8 KB Created: 2021-09-29 02:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a89905880302edc14e6d63fbdffc1ba7 SHA-1: 6a13c7603ea171e598fb534159d888a1f7af2a3e SHA-256: abd949b0d776113ee5bb5ca15e655a57a5fcecf6cb0bfd81c133d6731add09f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains or are structured as link farms, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and the presence of numerous external links indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://siangyun.com/upfiles/editor/files/muworutavuxogove.pdf In PDF document text
    • http://hocomesun.com/upload/zoveparajamelofijopi.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/segoxagi.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/82552219528.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/zagariguzomibalukebeza.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/kelokiwodowoverusa.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021092021233610.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/zexojazewulofinexulubaxiv.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147f578105fa---porikipipivu.pdfIn PDF document text
    • http://kustari.net/userfiles/file/muzis.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/tevamubuv.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/70823729744.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c265dd1dd0b1c66c4e0b8165582db92a/puditijaxukilikowad.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/82436736374.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/baxukikaxuzisubevilaz.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/98650503047.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/nibotuvoruxodaf.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/53442654103.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/lenipizenonu.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/c26dee3e2bb2c6317695c3c9c350c65d.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/jotaxubo.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/dunapufixiridenejixasut.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/73283112012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=gtg+vpn+appPDF 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_off0000b409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1F 9872 bytes
SHA-256: a4dde1ef633482b19cc844be5059ad1b8e3aec2bd861fc818e26686842bcad72
font_02_sfnt_off0000e203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 20184 bytes
SHA-256: a3074ef5c90562bd23a7c6c01f2f00f3c9d8234c3cdc48fa823f1be980ace98b

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