Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce994e757d80bfe…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 00:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fe64932aa3645a0fe1509cca9c91e1b5 SHA-1: df3d73bd10cf886d06818872243318a541dc3194 SHA-256: bce994e757d80bfea8c8f9b917cc527ad1c654277a69663a873c0426cdfa98d7
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 embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute content or phish credentials through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=idle+fitness+gym+tycoon+workout+simulator+game+mod+apk PDF link annotation
    • http://yasaitogo.com/uploads/files/gebisosisi.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/kemifikinolurebufe.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/waxuvuduruxugakatixamaw.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/386dbf112c52fe0a28d8c14a289accf1/zufinalikozisovasim.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/rotagodeluwutuwuvetu.pdfIn PDF document text
    • http://techielingo.com/fck_uploads/files/84422715069.pdfIn PDF document text
    • https://miet.hu/kepek/44429301215.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/16961767419.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/kd6gh3sfl801mg30k838pjef4j/61158575448.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/tikasogomewibizukesiwo.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090700321655.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/panoxobopowumukipagazivo.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210913/file/47519856774.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/20538482178.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/paraxaleradowatu.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/jujogigemokowak.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/pafoxalawuzigibaseduf.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/84233811483.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/webezifisojagubejowu.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/77060441065.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/48087063749.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/kalupeja.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/gagiduzomurutaketi.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/jabevoza.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_off0000b248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB248 15280 bytes
SHA-256: e97abc60bfe417f3f14f6adbbffc09f0451a9eb586f5c03a3402d31e3e2728cf
font_01_sfnt_off0000d8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 11308 bytes
SHA-256: e51c58251fb551df733902e9dedd4d01cfd6a66d2ffeb9699cab4ff9788c462e
font_02_sfnt_off0000f320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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