Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1a51ffc14269f6…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 06:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c59e3ae6050a5061a456353ad39698ef SHA-1: fcc7fe81ee28e8c64fee6895d1db6525fc305c16 SHA-256: 4d1a51ffc14269f6a58af79739a6dad9bfb87c528aa66d7d15c06eec9dfbb5e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, many of which are structured to appear as file downloads. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links on potentially disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV detection and ML classification further support its malicious nature, likely as a lure to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=watch+soccer+replays+online+free PDF link annotation
    • https://greenlandpark.com/uploads/files/57988668030.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/87409674990.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/75224846677.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/40393314854.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/40082262999.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a139f0a0ffb589042854cddb87994656/51823410836.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/24016849530.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/89324863168.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/deruwiti.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/dipuganuvozominofoxo.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/11355506227.pdfIn PDF document text
    • https://citronel.com/userfiles/files/13108543668.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/44017617812.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/40883670875.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/12745329194.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/32953663118.pdfIn PDF document text
    • https://protrialse.eu/files/files/tejefir.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310546aae78---tonasimimisimejefujutofim.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/moxuwonisowix.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/15556845511.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/jeraseravebaduwopo.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/naxenuze.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_off0000d958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 18084 bytes
SHA-256: 3799341468ac9fabdc95c8a00eedb1f589eef34fa45df0a7df2504764ce85604
font_02_sfnt_off00012038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12038 10684 bytes
SHA-256: cebad1f8343f86cc5fe0bf6bba92f7dac27c50bfd4c905c128480e2af80f6b00

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