Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff74814663d99de…

MALICIOUS

PDF

87.0 KB Created: 2021-09-08 19:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d2dba09635cc3e50df7dcc7388d24c88 SHA-1: 4f4ed328e09dfa6c4fe83632e67bfbff489de2de SHA-256: cff74814663d99de36f54101d408574115da48e1963981bcddd929dea4145007
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external resources, suggesting it functions as a lure to phishing or malware download sites. The PDF structure and embedded links are indicative of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=pancreatic+fistula+pdf PDF link annotation
    • http://fatamorgana.fr/uploads/assets/file/beledaw.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/59720682849.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/56507519730.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109081430502770.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/64716313022.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210908133557.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/47722958945.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/99776051016.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15408753475.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/70140714996.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/rusozaperovape.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/sobonosezizozaxupu.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/14048999629.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/lifefakisowug.pdfIn PDF document text
    • https://hoavily.com/uploads/files/19350466455.pdfIn PDF document text
    • https://pixel.bg/img/file/17140228180.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/gazedesipoxunezuviwazusi.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/21698132053.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/4751039383.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/85143930215.pdfIn PDF document text
    • http://cascad-trans.ru/files/wumusogisofabusukotonix.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/vixumotapikolezowebofora.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/82031143512.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138cf74cb397---21086270629.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_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 10596 bytes
SHA-256: 4db106f9045b4e6a9eb631e24b7bd3a4912ecec34acef493ff78f7f4f3976ff1
font_01_sfnt_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E92 18612 bytes
SHA-256: 20cdc5b6d728eae5fc3c1747f48cf4c532c9031fe74657bb0d74f2b9d01b3b86

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