Malicious PDF — malware analysis report

Static analysis result for SHA-256 f704cd21844e6d10…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 15:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 80eb899e5884795b7d473cf8138a545d SHA-1: c41fae62cc35081c33da7622fb4e23a976b98293 SHA-256: f704cd21844e6d10c4debc82e310a1b0ddf78e7b4c78d76a4187e60f7e41e1ab
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it's a link farm and uses an advance-fee scam lure, suggesting it's designed to trick users into downloading further malicious content. The embedded JavaScript likely facilitates this download or exploit, though its exact function is obscured.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://giteduguedesboires.fr/userfiles/file/tokexurunituvawawuxobes.pdf In PDF document text
    • http://ryanoomen.nl/uploadimages/files/sitidulunagasopa.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/bigolitifututifeg.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/guwefodokewu.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/zudew.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/stmvn9inln2dlpmj8060lej2li/20052405680.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/zamewuje.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/43071234624.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210907221240.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/favufisavazinitolitupava.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/28876887257.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/30773633592.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109110102363119.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/filexevuwelapufo.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/35013848977.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/zeteronad.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161371665a0056---17638988243.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/6772564480.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021091212382884.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/55511347860.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210906_D7A31ED9EEDED13F.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/kiruxoda.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/41416473381.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/45435471931.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631193085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=davidson%27s+principles+and+practice+of+medicine+downloadPDF 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_off0000d6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 18696 bytes
SHA-256: d259fd7a56af6ecd5a483d34f0494a6fa927aaec5ce8c94262f9d1b0a41c8626
font_01_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDF 10968 bytes
SHA-256: 21b7faf237bfc6f0cb25600f45946b6dc538bb689344a65fa1f554e8eb348d03

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