Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c31ee278d848c3…

MALICIOUS

PDF

71.0 KB Created: 2021-09-19 13:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f755ea1b3d48f54e4d3bf206857fc3e8 SHA-1: 8b5ef6dc31f31f32394c9c5008489af97a6f3deb SHA-256: 25c31ee278d848c3e36f5aa7476d8dd63f64d169098186571f08adc6d2ff406b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's designed to host numerous links on disposable domains, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436465b88f7---zumisuvodotuwa.pdf In PDF document text
    • http://gtlfuelmarine.com/userfiles/file/bogaxakulo.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/73311408839.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/56452688591.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/suxatupixekut.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210910011944.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/17622947864.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/lutujukivisunarijoreka.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/72743002475.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/beveseponemove.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/7355982830.pdfIn PDF document text
    • http://homeopathyhk.com/files/73735337893.pdfIn PDF document text
    • https://kawanmto.org/contents/files/81885132479.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/73068072409.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/82469264175.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/65567660604.pdfIn PDF document text
    • http://scarpatti.com/files/84643529101.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/70455096892.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/fuvazotakojipebagavu.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/39984845105.pdfIn PDF document text
    • http://yejida.com/userfiles/file/17334890237.pdfIn PDF document text
    • http://cmtsport.com/pliki/tozuteraba.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/98903504820.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/durusepani.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/porokasozabip.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/guworo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=learn+hacking+using+androidPDF 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_off0000b556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD68 16180 bytes
SHA-256: 7384226017bd7a15f0186d6ea24a2e152036dedd75eb14dbc3f537aa81b9242e
font_02_sfnt_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 10656 bytes
SHA-256: 42fc25d0e993152048f8d80b41897c81de935f1b48e1c213a7e0fae722a81043

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