Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ef915db1ae99ce…

MALICIOUS

PDF

87.2 KB Created: 2021-10-10 05:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bb79acffc2477fbea2713b1db2d6f52e SHA-1: 52f242bf7b4fff44c489be2d3fe7b3c00a9313e8 SHA-256: b4ef915db1ae99ceee323cbc548ee5e1b5f26d1f6eab7e32381c77ed7c201bc0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, indicating a phishing or redirection attempt. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic specifically calls out the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://att-na.com/upload/23361370403.pdf In PDF document text
    • https://computerzone.pk/file/puxunifokiraterukewazofex.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/nusimigudawaj.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/gufupujoninaliso.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/rilatowebagotipirugelom.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/zunobolemufemoxe.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/finoxarufinawageragom.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/fizatanolumaluji.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/borigeguvujafifemij.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/15988310536.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/46250892235.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/lafowija.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/3479844608.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/18519613503.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/61016575228.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/vizemojunutadonorisor.pdfIn PDF document text
    • https://truongdongkinh.phapluatvietnam.com/upload/ckupload/files/98987238165.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/6699340638.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/dijerikaxolepowitizubovi.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/jujularomunepikazuvirafat.pdfIn PDF document text
    • https://ka-base.no/images_students/files/kakanusesufegowokup.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/67792144245.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/neleturebafawaxodilobak.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/xoselikevopurosozaledoduv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=spring+batch+with+spring+boot+tutorialPDF 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_off0000ea83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 19460 bytes
SHA-256: 982f7597a9b7f6a2802f02f0e1a145a6178bd620953182b53328c1b86ffcb3a3
font_01_sfnt_off00011dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13613 10924 bytes
SHA-256: 2391c5847640683536f51f559f7291c1e28a28260a4ada8a11b0040d37a651d6

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