Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e79dfca6b83979a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 21:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ef6d58ac3ebf2d6306a96da990110e0 SHA-1: 9a1fb8505c57e0744543c2b8c6e15a0eebdb998c SHA-256: 7e79dfca6b83979a8324e52ec342abac36c8ff40cf7deaa0998f3d7794798c96
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 or trojan. It contains numerous embedded URLs that point to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://inwebjor.ru/uplcv?utm_term=watch+baseball+games+online PDF link annotation
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/pisesovono.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e50f94ea46c2817879deebbb4585a0d9/19138023453.pdfIn PDF document text
    • http://landpas.pl/upload/file/kibiluwuvanujarukuxik.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/41729116226.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/24984213562.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/kufap.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/6974270364.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/90455140732.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/21052963562.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/20505126776.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/lomubo.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/52092442269.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/31611706051.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109111117336798.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/xijusujujedopuxe.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/19917068296.pdfIn PDF document text
    • https://hoalavender.net/upload/files/libisag.pdfIn PDF document text
    • http://crm333.com/documentos/file/13328133687.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/88226664989.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/bipinutupejomenida.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/tapofegijafunababo.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/13468712299.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_off0000d760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 18296 bytes
SHA-256: 609ba83f061e202330ee2678adf4dd635b17bea03c0ac7287a51909e5b566ada
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8F 10712 bytes
SHA-256: 8ac2d64c7e4bd5a9025c67329e95ff1d277916e5ac7f31adbc7ea26a21e2bd85

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