Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80006cbc0fee45d…

MALICIOUS

PDF

74.2 KB Created: 2021-09-22 13:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1c213a1d924c171a9ef1b1f1e0e0411 SHA-1: c595ba1c5d7198149c9569b77db6b6b092d1735c SHA-256: c80006cbc0fee45d297767b81bfdc9bf74ae32be7ca76b3cb2ce43f32179806e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a medium-severity 'PDF_SEO_DISPOSABLE_LINK_FARM' rule, indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://at2-turbo-j3t.com/contents/files/davibasadikoki.pdf In PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/69479071192.pdfIn PDF document text
    • https://yellowstonewildlife.com/vemitav.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/3tro6qotj79cjhdte5a2ahndt5/74402587944.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/jupidif.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/fikusakekumiwo.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/wedekozifesefevavovux.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/76737937742.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/pagij.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/dixutesafu.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/pakixefepajiravebovuvarup.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/zilupapepowowif.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/xusonumijiv.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/riremebenoratuzav.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/fawatiwofofo.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/lukosur.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/wubulofimava.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e689a6476b---8844755329.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/91258092021.pdfIn PDF document text
    • https://tenhucchi.com/upload/files/46170874215.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/nujivogomolibuguzobiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=batman+knight+rises+apkPDF 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_off0000bead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAD 10676 bytes
SHA-256: 034bef6410e35c33a7af701211ef0f83144c0fcd96971e647dd24ef5708ff006
font_01_sfnt_off0000d6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F5 17116 bytes
SHA-256: 7a654a9ff9dd43ea54bfa8b583b6fe083754d1ad85320b113ea2df3ba381a3ee
font_02_sfnt_off00010381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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