Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4aa507793337ff1…

MALICIOUS

PDF

84.1 KB Created: 2021-09-21 09:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 464743393fda1f58dd5f3e87f1862965 SHA-1: 399d5c5b74844c32715a2e1c94b7eb2a74944834 SHA-256: d4aa507793337ff1a1b16b3b0b148b2c6ed27baae050bd03ead3debea066b052
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of embedded JavaScript (T1059.007) suggests potential for further malicious actions within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://educationindiajournal.org/ckfinder/userfiles/files/xiveduwavopowenor.pdf In PDF document text
    • http://banner-ever.com/ckImg/files/75635353004.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/luvin.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/niwudavuvegamojudel.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/18769711814.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/12415029183.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/digegarikanoboderelekuwu.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/rapowuguniwojurukoweso.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/mewupaxabibapevigebejabub.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/lefazogusezigudat.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/ralozusitobuj.pdfIn PDF document text
    • https://kildevangen.dk/files/40948522792.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/69878870391.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210907_193542.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/e219d4213e85e3ded0314698ca833f2f/xaguzuregijoveduga.pdfIn PDF document text
    • http://potya.com/lifibudineramo.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210908135443.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/82148048696.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/pakitosolevu.pdfIn PDF document text
    • http://levotst.com/uploads/files/79376129871.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/3699680871.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cb8095163---64144482379.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/masokubevoxi.pdfIn PDF document text
    • http://yuli-china.ru/d/files/jirunaludifigapirivipigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+phone+utilityPDF 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_off0000e477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 10352 bytes
SHA-256: 26ff89d51cc35ef61c1492859a3379890ef490a6d9ec8cc8e2981b1f4b6e4eff
font_01_sfnt_off0000fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 17896 bytes
SHA-256: ba330015f37b19aec26e31ad014fea32de3f5f9de5aeb4d305c1c0f925542d54
font_02_sfnt_off00012a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1