Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7de016a901bc58…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 05:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d2d421a9e66047c0376a70c1fabe2b00 SHA-1: 317505f0150979a90469354d7b9cd7099c0833b4 SHA-256: ea7de016a901bc5874007605263e71b31b0eda41f471cdb77e56c967882f6597
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous links to external domains, many of which are likely part of a link farm designed to obscure the ultimate destination or distribute further payloads. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dreamscar.eu/userfiles/file/12196231738.pdf In PDF document text
    • http://purel-biopharm.com/upload/files/89865512637.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/1c427ab44435101dbc87cab7c0084adc/5069292642.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/32341830157.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210910102827.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/povubuwimenuki.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/rumumeboxuwadadaj.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/18976415369.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/guxupituleku.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/58617836778.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/jefivofidikizugupa.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/xagiwulomedizevawesutuso.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/11734832623.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/9818208636.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/tovekejunafejuzubotuw.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/54885348237.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/84463235295.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/revurutupifom.pdfIn PDF document text
    • http://julianina.de/upload/file/tanukabolevefagumigu.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/16007534041.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/faladelusodafe.pdfIn PDF document text
    • https://steammining.com/userfiles/file/54690161948.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-10/20210910174354444530.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/30791766861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+make+android+like+iosPDF 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_off0000e2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEA 17300 bytes
SHA-256: fbc079cef85e6f48871c6a95bfa181f083e33f27af74cf306e350e55b4ad0533
font_02_sfnt_off000127d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D7 10580 bytes
SHA-256: e9590eec058c0ced6b0fe705d6fc4c9ee59cc7211a5063ff3d9fe244b29d7c98

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