Malicious PDF — malware analysis report

Static analysis result for SHA-256 aede90053e820466…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 02:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2e9bfb90ffca43e05e0404a094aaad44 SHA-1: 1df1bda12e922b74b3452af3bf2cd364d35b9e12 SHA-256: aede90053e8204668d29a66080019ab5466dee9271c860f1fb9c2adb83036753
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 numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to direct users to malicious content. The authoring application 'wkhtmltopdf' suggests the PDF was generated programmatically, likely to obscure its malicious intent.

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://catamma.ru/uplcv?utm_term=film+box+apk PDF link annotation
    • https://ever-progress.dacola.com/upload/files/11881256823.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/kakaxatiguwobopek.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/27126034586.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kadunofinimuga.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/10606735424.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/22693342804.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/nikibebobete.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/supenolofopuvexodon.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/xobumawol.pdfIn PDF document text
    • http://dfanchem.com/upload/files/malosazudutaka.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/puxaxasidesukos.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/52079015036.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc8a15e44---risuzibanesolunolumi.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/nikezetasilepuxag.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/44172294072.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210909_083851.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/65370768387.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/xinorozuje.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/37386112604.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300e52b68e5---jamofavevuko.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_off0000de02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 18380 bytes
SHA-256: 265062595c5857d747ea21b29f843c23a21beeaae48bcae3d6be8659b5160169
font_01_sfnt_off00010ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F2 10124 bytes
SHA-256: bf7b597f225c62127a18ea43116d0eaa34bce9521fd86aa5b5ce042febf4d29e

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