Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f653d9e27238bd…

MALICIOUS

PDF

71.8 KB Created: 2021-09-19 11:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aaf56ba75fe2313bce1e72c0e7553e14 SHA-1: 317084af0f2fe164eca6d30ce08818588b467f05 SHA-256: e4f653d9e27238bd6c348a1a67f9c24ca717766cb7feebf5ec052585fe03cd38
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, including one that appears to be a redirector for potentially malicious content. The presence of external URIs and link farm characteristics suggests an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://huntic.ru/uplcv?utm_term=football+strike+mod+apk+download PDF link annotation
    • http://marmaraisg.com/images_upload/files/menabakilabipino.pdfIn PDF document text
    • http://www.polni.si/Images/files/28665637562.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/49679478089.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-4/20210904025324895385.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/totugerudi.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/segebefodex.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/21890784904.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/71601494493.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/mosaxanulukutumuniva.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/tafamona.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/4419750619.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/sejagaf.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/gesiwe.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/75407271019.pdfIn PDF document text
    • https://majubesar.net/contents/files/gavedamigutamotaneru.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/29226807596.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/52477013327.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/tininivimebubo.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_off0000b4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0F 10848 bytes
SHA-256: cd2e758342db258a1fb99d3fafb000d4075582c8404f5f2d050274de2ebb7087
font_02_sfnt_off0000e5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EC 16908 bytes
SHA-256: 4f748d8f62445bc1a32a67e8c1fb352877f129b5f04b22587ef529d21e0c1358

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