Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbac1583ced9a4d…

MALICIOUS

PDF

93.5 KB Created: 2021-09-24 11:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 057cfb9fcdc6937ead90ad5bf07dfdb3 SHA-1: f660b97e574cde3a8e8177e4f2834bfb51aeba0f SHA-256: efbac1583ced9a4de281f56bf862e948665a447595834cffe833a5d5dd84d309
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, indicating a strong intent to redirect users to potentially harmful sites. The `utm_term` parameter in one of the URLs suggests a lure related to online games.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=next+one+piece+game+2021 PDF link annotation
    • https://baoyi-chuck.com/ckfinder/userfiles/files/91182960741.pdfIn PDF document text
    • http://wirheiraten.de/images/file/nivopoba.pdfIn PDF document text
    • https://capitolmodels.tuzonanet.net/userfiles/file/60244568612.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/nokogupinidi.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/12719656015.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/18540859401.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/dinavuxozatosun.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/68877650487.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/megisifozajiweri.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/67580862366.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614bee68b1dce---5833523356.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/maxamudokadaneridax.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090709263873499.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/dotegukaw.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/96444918841.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-11/20210911080114187307.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/bowatazi.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/nurozaperaluxij.pdfIn PDF document text
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/64447193116.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/40517142201.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/refatiwonakiri.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/48026328679.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/lugaleximexuzere.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_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 17984 bytes
SHA-256: 252e93902fdb8a79d93c0062f2223a5b4bee4f7d32fda19951e719681241fb2d
font_01_sfnt_off0001373b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373B 10776 bytes
SHA-256: 9fb69aaadfc03248baadc0c1998ed9f0c5e31e8373c4570cd143dacfa700c307
font_02_sfnt_off0001502d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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