Malicious PDF — malware analysis report

Static analysis result for SHA-256 479d9ffbcdb42d5f…

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 08:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c96f1d6a7731dd888b87ffe6a90fda22 SHA-1: fa24ba84f641fe7a441ae70683c7edf3a8492ea9 SHA-256: 479d9ffbcdb42d5f41b5a12d482d9d5f0de502dd94b750d9392fabc146e012bf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs pointing to a link farm hosted on various domains, with a high number of distinct hosts. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through a network of disposable domains, characteristic of phishing or scam operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chikatere.com/Upload/files/85851584704.pdf In PDF document text
    • https://goodline.by/userfiles/file/botegurufela.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/zawuxovalus.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/12759734609.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/17381514190.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/dusiwubevafavepunebola.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/welupumunalazifaxek.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/xujowasasudijafotakuda.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/66964714696.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/rarejudivesev.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/4642731445.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/wegogiv.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/76643960245.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/dopejabexat.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210906152130.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/vekal.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/16268762276.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/jewaxogugodufisoze.pdfIn PDF document text
    • https://reniuved.it/file/81625319600.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/43191307307.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/silugusojafaxiludum.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/nilegetezogigejujelaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=essential+grammar+in+use+keyPDF 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_off0000c892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 18620 bytes
SHA-256: 4ce51229cf9b11796cfca468c9396389a90618b9cedd504eef6526e9b87e38fe
font_02_sfnt_off0001103e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 10620 bytes
SHA-256: cc42d6ed0d52652fec543db6055ed5456da60e2c4f2cb541b027347435510cbc

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