Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d38c64e934cf0b…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 20:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee1e7dc2b1f5c44dcea7361e0117c989 SHA-1: 7751f4ddc0ead9f50e09e14133202ba97c7601b4 SHA-256: e8d38c64e934cf0b4f0ca17a48bb3515db028b5c4dd4db6ca2316dd349bb68d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://rh-h1tapi-turbo.com/contents/files/64356234050.pdf In PDF document text
    • http://uni-soar.com/userfiles/file/zalebitago.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/84144592601.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/78674063462.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/83824119174.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/14184379193.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/ruzeserazexuwu.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/56079043678.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/81805171856.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/76570755994.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/10685482578.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/wikoxe.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/jorezowetopi.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/69959436602.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/difogada.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/28775552422.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7a3533bb52f25ab9ee810ff8c319d92f/livabe.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/nulidevakajowutipejara.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/38235247248.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/57761929625.pdfIn PDF document text
    • http://skncn.com/u/files/piveluruxobazavopewi.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/wozilubikurogaworabevi.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/zutarobunolelimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=can+i+use+my+phone+as+bluetooth+speakerPDF 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_off0000b766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB766 10992 bytes
SHA-256: 4c04c8a6392441da0193dd3ce9e236fcaedbec3c99f1f93b7c45dc4cd19d7f9e
font_01_sfnt_off0000d091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 17524 bytes
SHA-256: 0403301d9e6072c70b15b996114aaf8eca928da26c71a43d02264af1b969604a