Malicious PDF — malware analysis report

Static analysis result for SHA-256 529fa435084fe78a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 14:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ae7cc9a9cf28a89aec92e81fba6a731 SHA-1: 8ae7e584711ef44f2d2fbcf65958878762e80e31 SHA-256: 529fa435084fe78aa54284d2eb3771aaeb5631a48cc86e226b07b30007e3f236
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'infrive.ru', suggesting it functions as a lure to external malicious content. The PDF structure and the presence of embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=scary+ios+games PDF link annotation
    • http://stadion-zarya.ru/ckfinder/userfiles/files/wapasositibavojalit.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/jopenafutusafaxozuxagud.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/18973658755.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/210b8c295e96d2dc36bb01f76bd449e2/47153027120.pdfIn PDF document text
    • http://retrofotr.cz/files/file/94950866667.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/33360564364.pdfIn PDF document text
    • http://htwy.com/upload/file/16027515529.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/99581852350.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/govubuwisowuluba.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/susolemivalo.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/sofokamenoxulegaxefunub.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/5809950084.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/31667766868.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210901175527.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/govudin.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/dibejuwowumixusasakox.pdfIn PDF document text
    • http://exosushi.com/uploads/files/82331038082.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/96476429883.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/leluwupoz.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/womuxawamisozefafajigitut.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/lepojuzevudutoxo.pdfIn PDF document text
    • 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_off0000d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 17996 bytes
SHA-256: 67d41285bbf01d31947bc20c4b6a030289b0cb744fc355df2a36aefc66b31015
font_02_sfnt_off00011ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE9 10512 bytes
SHA-256: 823df9e265aab7d6ef71d783d7acf6486f0f751b943873879a1383fa436b226c

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