Malicious PDF — malware analysis report

Static analysis result for SHA-256 56cb23071a18b26c…

MALICIOUS

PDF

77.5 KB Created: 2021-09-30 13:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d113c92ebcab5278bfbe0a626b0a41f8 SHA-1: 513ce3af53b098d272dd47a33071c095136a775a SHA-256: 56cb23071a18b26c6e0ea8a7c66209fadc0d429aefb44d5e102103c5c8780c62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it functions as a link farm. Numerous external URLs are embedded within the PDF, suggesting an attempt to redirect users to potentially malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://sthouseluxury.com/upload/files/19248670889.pdf In PDF document text
    • http://fsgpj.com/upfolder/e/files/20210908110907.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/98334313713.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pueu579vjlkcdqgse95u87pbp2/38778006915.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2109131407593194078kvtez.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/48897705634.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/zobekafojatexakej.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/xofibanujarubevukoxe.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/33145289771.pdfIn PDF document text
    • http://evola.it/userfiles/files/91576415758.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/xojarokut.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/71800667634.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/65518685944.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/sezibiseme.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/vefij.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/viwoxunazododusaxobupefot.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/fezowisanalifikomigumo.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/bejalegajijuritatogewezug.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/85719834113.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/dapeworosoxeto.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d9ec2c9897a154016bd3f95ea8e25d05/74791109193.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/vaxek.pdfIn PDF document text
    • http://wohingltd.com/userfiles/59457966243.pdfIn PDF document text
    • http://domainecomps.com/documents/files/gogorozubud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=square+root+of+negative+fourPDF 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_off0000c1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 20328 bytes
SHA-256: 73147696bc662897d91a6991afebaae58602339f30c5d7d0ced7037be41bfc21
font_02_sfnt_off00010e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E93 10560 bytes
SHA-256: 71565245085003217c67e7ef00ab08cbd883f139174cb74954d5726950cf4376

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