Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a0060e3e620862…

MALICIOUS

PDF

74.0 KB Created: 2021-09-19 16:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d8ad295394288198f9007095730ff6d6 SHA-1: 7555fd2e3e6d3a7382aa97d7002cc5348dbf63f6 SHA-256: 91a0060e3e620862ae9563f8d1752bd5ac7c3dc653dddc5bb0d5b68e5bb55fd2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs pointing to disposable domains suggests an attempt to create a link farm, likely for SEO manipulation or to distribute further malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://jjcfurnituremaker.com/userfiles/files/dekezesajowesigasupop.pdf In PDF document text
    • http://linker-apps.com/files/koxalawubemofukefoge.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/jetajisugapiduwudavus.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/latorukigevofa.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/1525645332.pdfIn PDF document text
    • http://4bx.pl/public/file/32304152533.pdfIn PDF document text
    • https://mackbeks.com/files/file/50670904527.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/jenigejajosarexuza.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/tujagewuvezopulitefe.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/24511272074.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/23065877916.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/letexizexilefuneve.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/tibif.pdfIn PDF document text
    • http://pnalog.ru/images/file/7663007809.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/76683977999.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/71141001983.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/ratunovonuza.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/94573559436.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/22922182374.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e061a1007ba605f7abc6665fbcf50845/23237929670.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7eacb6cb3693759bce7de4f51836110b/8943188175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=movierulz+online+websitePDF 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_off0000c111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 16464 bytes
SHA-256: 5069b6526d28e90e540a626fc8321a696590e13660ea9591f37188d127911cb5
font_02_sfnt_off0001038b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 10384 bytes
SHA-256: 8e425b96e8a8b1005a27d296754b044ebb9d1ca9a7516103d383e23ed3290635

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