Malicious PDF — malware analysis report

Static analysis result for SHA-256 c187f7eb4c7150af…

MALICIOUS

PDF

69.0 KB Created: 2021-10-02 21:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ebaa458d38afef98b6b910f37b6fa66 SHA-1: b6168d978d04ac663d186fa20d46ee57bbe1ebb6 SHA-256: c187f7eb4c7150afcd09db79f36c130cdc84b652dce55903d453d41dcc172f64
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. It contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nhuaduongnhapkhauaz.info/upload/files/tumepetimofizavusawebegat.pdf In PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/biroloworozabid.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1490128804613baec208c94.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/tejopanul.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16150fb94d152f---gawal.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/91475109050.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138215943463---zamolobudat.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/vukomilesepi.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/pasovusasorigi.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/boserefepaxibewiki.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/88854895067.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/baxufuvurosa.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109041248077778.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/67037368542.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/69277084640.pdfIn PDF document text
    • https://norservis.cz/files/files/91443019346.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/vakabuboxesurijasuzi.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/tefele.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/97375665794.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/lokufofezabugabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mere+brother+ki+dulhan+full+movie+with+english+subtitlesPDF 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_off0000ac8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC8A 11280 bytes
SHA-256: bd4ee6ec049c7fac857ce8396c5cbbc6ed32de2d87f07a287502d6c284e4a4d1
font_01_sfnt_off0000c6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 15580 bytes
SHA-256: a7c2b552d75d586dbc8a880ba03e6acfce5c577bd56a4d7ebc764f2c1e03850f

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