Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3acd16d089b2b1…

MALICIOUS

PDF

80.9 KB Created: 2021-09-24 04:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ddb8484bd8c2f8dadeb2b689f6608fe3 SHA-1: 955aa6ded2390121f3f41657d85d3cce78a60391 SHA-256: 9a3acd16d089b2b1a2d002fed47c718288ec6d382e0bc2dcede510ed239c8515
134 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The PDF structure and embedded JavaScript suggest it is designed to exploit vulnerabilities or trick the user into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131838e50b25---jopepanawejotavobemiwom.pdf
    • https://benmoonpharma.com/userfiles/file/3006053364.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/14099392722.pdf
    • https://agencement-menuiserie-var.fr/stockages/files/23456165464.pdf
    • http://oumkua.com/userfiles/file/zasutojadozepek.pdf
    • https://labelmarket.pl/data/file/4915994974.pdf
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/sogoxuxometagitogodo.pdf
    • https://bankkartya.hu/js/ckfinder/userfiles/files/mujukegidevanugibodigufi.pdf
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/zugafek.pdf
    • http://gonzagafood.com/userfiles/files/91333902777.pdf
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/3577871789.pdf
    • http://tmkb.org.tr/ckfinder/userfiles/files/77768745617.pdf
    • http://bong-dem-long.org/upload/editor/files/norusalipetemusiwariki.pdf
    • http://vigen12.com/userfiles/file/vaxapana.pdf
    • https://zoomkish.com/basefile/zoomkishcom/files/36919771432.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c14b7fab0---kinilatitofij.pdf
    • http://kovovyroba-nosniky.cz/UserFiles/File/kawojipakusinuduno.pdf
    • http://crm333.com/documentos/file/pufelisutate.pdf
    • http://thaoduocvn.com/userfiles/image/file/pitisilewalavifatejilis.pdf
    • http://baracenter.be/userfiles/file/garinugugijenetenatug.pdf
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/lanapivote.pdf
    • https://cevhertemizlik.com/userfiles/files/gesafegujuletojasije.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=rogue+one+putlocker
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d34b.bin
f2dc45673103b01709ce49f738a11420d1df7cee637a7944a44fbe69e6163260		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD34B 19976 bytes
font_01_sfnt_off00010576.bin
fd318f38825dcb5b315277a281647da8eaa2dfd229945a9a5c178579f9cbba27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10576 10364 bytes
font_02_sfnt_off00011d0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0F 16792 bytes

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