Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b84047b9389e00…

MALICIOUS

PDF

79.1 KB Created: 2021-09-24 05:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ceade7a879ea67ba240a521fd6c7c493 SHA-1: 8a8ce21e7e3805083af93283e6a4b0645e227a4a SHA-256: f2b84047b9389e0049f20662b0273e9995334eaef4527dc4498291d0e9a5ea0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on distinct domains. This suggests a campaign to distribute malicious content or phish users through a network of linked documents.

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://www.savininkai.lt/ckfinder/userfiles/files/88369914744.pdf In PDF document text
    • https://gymlesgeants.com/upload/editor/file/95556229769.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9d045ba2---nurekopofaxijew.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/mamixodovuwolofimisatake.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/fepedosijom.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/85299262132.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/boluparo.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/87638353723.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/takaw.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/54868797577.pdfIn PDF document text
    • https://hoavily.com/uploads/files/lomotipebubijepefilafesi.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/belezemixe.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/genurugeromenunex.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/89470352879.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/mekerago.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/pofidap.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/senizojin.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/rinivoxutomosuxe.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/luwalilizozelilarivukomin.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/jejubis.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/zitemali.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/68848194138.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/vusevanik.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/fakojazefimisafodegukukof.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161382ae3651d8---24056576549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=elemental+geosystems+pdf+freePDF 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_off0000d2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BF 10844 bytes
SHA-256: 2574979ab69cf3f14fc5f11112df07b21e5046d9bd078edfeff81ba90daa82fb
font_01_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 16852 bytes
SHA-256: c619b64b312be3a7092d214d94371a0acc56ec2a8a22bebbc47028aa89e35118
font_02_sfnt_off000116bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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