Malicious PDF — malware analysis report

Static analysis result for SHA-256 584ca25f0e88fd7c…

MALICIOUS

PDF

76.8 KB Created: 2021-09-11 14:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 5bcd1727cf20eb205ba919a5948a2b39 SHA-1: b2c2dc491d8cd520f46445db4c849a6da3daba91 SHA-256: 584ca25f0e88fd7c6706a35d7116d6669ffa95c9071381f3d31eb61116e88c42
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The presence of embedded JavaScript and a large number of external links, many pointing to disposable domains, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://gullyracing.it/admin/ckfinder/userfiles/files/91021357328.pdf In PDF document text
    • http://holland-ex.com/images/blog/file/tavebaxavapete.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/53249899666.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/farerepen.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/xagetetobodekabakefavi.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/79187104660.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/88736047842.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/84808511992.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/gusepis.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/61203117823.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/96238585258.pdfIn PDF document text
    • https://sinarwaja.com/account/files/fokopofoxujofugu.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/40920330047.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/subiwopudisulanepad.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/godazanodenuzedesikid.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/2939918969.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/22065926758.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210910170347.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/9567739460.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/duridogulivubinazaziw.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/fawufepogezufobisudusapod.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/31657567457.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/mirakewegidijimudoj.pdfIn PDF document text
    • https://brakos.it/file/kusagoramog.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/56449088480.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/tebufikolofukixosev.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/20600155787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+battle+royale+games+on+play+storePDF 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_off0000c97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97B 10812 bytes
SHA-256: 7d90f0d934484b011b93610ed3fdc6ee868b8668c4b399d418c3500a7e30beb9
font_01_sfnt_off0000e252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA64 16728 bytes
SHA-256: 6a37a4f89902fd68ab48f50773012f881860b55ad9a8df8f61939678f44f3cfb