Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdda9e2d906877f9…

MALICIOUS

PDF

72.1 KB Created: 2021-09-19 14:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9764ad35ff41bb9122f485d67dec78f9 SHA-1: 68783bb871d96a4625e88b0eebc0c2fec37c8b13 SHA-256: fdda9e2d906877f98be09297fe648414ba50f4682bc514e150a229fe66853979
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to potentially disposable domains, suggests the PDF is designed to redirect users or download additional malicious content. The ML_NYX_PDF_MALICIOUS score of 0.997 further supports the classification as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://blessingsngo.in/userfiles/files/rajupejufatopivivovu.pdf In PDF document text
    • https://aporpeter.ro/userfiles/file/38976408355.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/fobaxukijupimilu.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/talexivasinazu.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fd97a605d---kalununagijajana.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/67411110329.pdfIn PDF document text
    • https://asiapharma.la/files/files/48308472299.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/nebuziragozufekobubogud.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/97856717868.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/bigunivuxewanev.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/81219510771.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/zajawawelatixibilarogam.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/nefuganerepusawi.pdfIn PDF document text
    • http://bociany.sk/media/file/77153298556.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/82532706650.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/degarilaropot.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/luwonodadukoxep.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a63cf9f4461fa20f362e73688c16542d/14970487274.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/34142071132.pdfIn PDF document text
    • http://tvsporedi.si/vsebina/ledafoz.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/36915007216.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/57084616925.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/8653860897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=auto+reply+text+while+driving+androidPDF 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_off0000b860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD077 10952 bytes
SHA-256: 5fd3d827fc1fa95e4bb42b808ebb975b8cc613572f5f02a37f43aeb9d75a4050
font_02_sfnt_off0000e99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 16108 bytes
SHA-256: bccabf3a994b66bc36770a8d8e1ee2bcd5fb5caceed79ea3c30b13b7367a4be8

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