Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1497c2e8d3e9865…

MALICIOUS

PDF

87.1 KB Created: 2021-09-15 19:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: fd48ef5d04cf1af0098dd19b63d234a0 SHA-1: 6acc8de1b3f3095f5adf746f407d9f55ab5d8d93 SHA-256: b1497c2e8d3e9865288566eb511bf0a66403273829027ec41517696fe156e073
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was classified as malicious by ML and ClamAV, and exhibits characteristics of a link farm PDF. It contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially malicious or phishing websites. The presence of external URIs and the link farm heuristic indicate a primary function of directing users to external content, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=minecraft+free+unblocked+games PDF link annotation
    • https://nordiskvillaventilation.dk/userfiles/file/13730940736.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/38471181522.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ce88fdc3---vuterasujatefadow.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/50448489524.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/begik.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161415425e9c80---fujaza.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/34412183202.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/35705986025.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/jatoriresesovozeda.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1148070177613d05b2ee156.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/tojosixuwe.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/forilamexepodumixofa.pdfIn PDF document text
    • http://ledins.lv/cms/file/dikejawogisuvixelagizenu.pdfIn PDF document text
    • https://gulamanis.com/contents/files/48858742022.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/dasutajosigen.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/gotilekofolakepupaseso.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/87619016624.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613724bd4ce8c---detim.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/pixaliwopibebimomanosowe.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/budatizomozulusukav.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/83051156514.pdfIn PDF document text
    • https://profm.hu/files/file/61001858953.pdfIn PDF document text
    • 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_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 18392 bytes
SHA-256: 8da679f1b4a6123fb44f7e3599c706b2b7e3365c4a69ba90af024dc1e4d28b31
font_01_sfnt_off00011ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13504 11144 bytes
SHA-256: 7564bf38e424d9f82f0f407a41cffd6f49652411c624329f7f8e492a0f21b6e5

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