Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfc45dd69be8336…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 03:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c2b1dc8017e387e84ee699793de74b0 SHA-1: 73de2fca563b48ccd38fccd5000e899b0b80f2d2 SHA-256: 7cfc45dd69be8336e73b6b2614cda051d51fefdef1bb06728d420d725e7001c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to potentially malicious domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document.

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 http://gugugroup.com/userfiles/difopodififabikoxenajisul.pdf In PDF document text
    • http://www.39koratmachinery.com/file_upload/files/newapu.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/patiganerawetofitifa.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/mamaxumobudiginitenoso.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/2126554323.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/73791629548.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed43b0cd55---taniwukesi.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/bafosijurutikefesigaboxag.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210914040057.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/zifopav.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/78083459901.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///57242321097.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/zawep.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/fomopa.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/pagok.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/vunekolijedunuz.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/jobowotop.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/guwejota.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/35996707011.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/61182663140.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/xasatesipirutasose.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jkp5ccdri842dkevs6dcfvv75e/90206676434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=physical+activity+mets+chartPDF 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_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 10452 bytes
SHA-256: f6c485339faa02113bb5b1b0b5a230797543177f30bfce0ba39b53fc55e504c9
font_02_sfnt_off00010d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 19020 bytes
SHA-256: 0fff8e0cfde1524d3f835da103c73cc3ac8b292134bfa5e71cda3870175d27f7

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