Malicious PDF — malware analysis report

Static analysis result for SHA-256 51da684509d4f278…

MALICIOUS

PDF

76.6 KB Created: 2021-09-25 05:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f100b5bef6a74d810363ff6d1c5be54 SHA-1: 74f70cb94c627be85068d6bdc20e38fff4d56903 SHA-256: 51da684509d4f27821e0f4f3952bc3cf72a20366ed24d0733ef192be0a503183
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. This behavior is consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.psoealora.es/ckfinder/userfiles/files/donunuleze.pdf In PDF document text
    • http://birzebbugastpetersfc.com/files/file/18536858740.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/totufeguli.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/rinevuzizazarepepu.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/9477058375.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/vavarubanuza.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/momudasir.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/xanodijivikoluli.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/71851441492.pdfIn PDF document text
    • https://beaszemin.com/files/51216501607.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/59610194598.pdfIn PDF document text
    • https://olajpark.hu/files/files/48997485869.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/49243089978.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/worimagefonilesegumef.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/pijatobenomitigulimoxevog.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210908_CA3AB184784BD0D3.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/tiruje.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/nakowojotexisewivekeji.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/fubenewifasite.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210903_130001.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/68702871971.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/89262474278.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/jopumebagukixijoxuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=icarus+deception+pdfPDF 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_off0000c3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B6 10620 bytes
SHA-256: 8e1c02cdea129a6f9a68c0abad0aba1e21485e8bc85044abe1d30d2513baa63a
font_01_sfnt_off0000dc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 19160 bytes
SHA-256: 3170856fd08625a23a89186f362579c9dc9fd5a48146b0f08b16319e1b5a6072

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