Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc5e52b1fe71b83…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 23:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fbd6f3da3cf0e9415edeb98b28196f40 SHA-1: 27d398cdaf10836d0f99c1ca4d35e2019b441c02 SHA-256: cfc5e52b1fe71b83b95ba74d90720762a9f1e20428a017a4d26272f8f3790a38
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, directing users to numerous distinct hosts, many of which are unknown or suspicious. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://gosselindesign.com/images/from_fckeditor/fichiers/tibonuxovafosexuxogo.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/3828057815.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135094b3d9c2---tilajovujabitotugoti.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/toxatezoxidoxofonaxusari.pdfIn PDF document text
    • http://viorina-deko.com/images/file/potunonurokopewajisa.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/lozeg.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/kumumu.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/99792497086.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/fozuzapezatateze.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/44361737537.pdfIn PDF document text
    • http://fitviewer.com/files/file/nuxebefiwifadajal.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-10/20210910124856664853.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/bafisa.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613197697a61a---purugumuk.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/48722049267.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/kemimubevopixagaxinabupoj.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210913062229.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/10159190314.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/45341973750.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/51139509885.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/51326336881.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/wenurugexopule.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/ninavimopazogenam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=adobe+photoshop+unlocked+apkPDF 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_off0000d40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40D 10732 bytes
SHA-256: db112cb28a49baf8d91d6afecd4b5669fbbe8a0706135ee7ad0b98a3cbb1c443
font_01_sfnt_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001048c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 16644 bytes
SHA-256: 9fe2604a17de26233761949b0676244cff75395475d4187564dea7a83967612d

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