Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa03cf9edbb9d48…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 03:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86b9492e3a16e081d092d2e62bab200e SHA-1: 4872026691c6402590f5b831e4caa13fd196570f SHA-256: dfa03cf9edbb9d4894a585d2ec7d2bccc1a6c31d9a7fabc31a335419e0692ad7
146 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://olynskiconstruction.com/pics/file/mexaruda.pdf In PDF document text
    • http://bulk-supplies.com/userfiles/file/nuzabilomomafinorupax.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/17068206646.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/xilusozojoti.pdfIn PDF document text
    • https://blv.by/upload/editor/files/bewasozuwifi.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/57536918053.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/zebag.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/reseni.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/94577705838.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/werimilotomovoxidubazo.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/17303479029.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/zenufamumux.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/80124269912.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613eccd0ea7c4---91425371349.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/32668702614.pdfIn PDF document text
    • https://flyags.com/editorResources/file///wamejagezowalikozesudado.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/11337484894.pdfIn PDF document text
    • http://rts-3.ru/upload/files/72456326133.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/kekowabafepusu.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/bosatini.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/63697001876.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/pawutenabidija.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/feruwaroziduwexar.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/25944849624.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109151454029532.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/20711282170.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/cdl7eh691ifo5s7g7lv5i3nvbq/jugeragafasevivoxidatut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=op+beyblade+qr+codesPDF 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_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 10636 bytes
SHA-256: a07b4cdf9b198284a1d825d2d60e95133bd7851da2f14c26da59045cf495e5fa
font_01_sfnt_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 17744 bytes
SHA-256: a51692a938e83dfa579b03eaf0efd00c9f6068152b02892121c9149dd45bee01
font_02_sfnt_off00012982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1