Malicious PDF — malware analysis report

Static analysis result for SHA-256 607d79314437bd44…

MALICIOUS

PDF

88.3 KB Created: 2021-09-14 11:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 65d66e80e23ff478ea3c64f7662843ef SHA-1: 2a30f8c91e45e38ed38812b79dae831a794fe2a2 SHA-256: 607d79314437bd44f16e85332d2eefd8a0cea61691d95633a61fe046fff8df84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting an attempt to obscure malicious destinations or distribute various payloads. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature of the document's content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://pileshoppen.dk/userfiles/file/34067191852.pdf In PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/bamupisavozasovufasaf.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/roxisunelozuresodar.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/fedifafular.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/pikumumimudowinususapuxi.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/38690911904.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/71465850404.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/20163474567.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613e375753b94---mukar.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/52038424831.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/zerugitijoku.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/81363469348.pdfIn PDF document text
    • http://enricobarraco.com/files/mekuluvesasabo.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/nixijesetamelorilefusen.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/87184325990.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/gogekemol.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/88020193190.pdfIn PDF document text
    • http://odumakus.com/uploads/files/wixifezaka.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/vebiguwipuxaxexinosat.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/34013290658.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8571943657.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/38221807086.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/81255758744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=app+action+movie+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_off0000f5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 10508 bytes
SHA-256: e4dc34f1e6f28215f6340dfc50898b22a08162a0140a524cd13d8e19d2271bd1
font_01_sfnt_off00010dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 17812 bytes
SHA-256: dc7961b59d69b2f2d2caa512afb941a2361c647a35dd5c627619543183654b19