Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7120e343248353…

MALICIOUS

PDF

87.3 KB Created: 2021-09-24 06:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b2220a80a769ee609d8c0db550915a6 SHA-1: 8735f2925a0ffb0a19cccc4806b51ee913f4a10d SHA-256: 8e7120e34324835354b22778a6c515628cede822d3eb3f3d6d797c76aa015b5f
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://clubmaniacr.com/campannas/file/29743021734.pdf In PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/womusakix.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/kodawutudaso.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/23369495940.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/60916777565.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/70748044885.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/mepilemokoveni.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/96971614603.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8379991985.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/vazefumubigonufubol.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/tebudowofonifev.pdfIn PDF document text
    • http://att-na.com/upload/savifilitorafitoxemaro.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/55141337547.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/virumowavuvozeluvujefa.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/12196364423.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/3d17e05c0bb4989a12c3d610514cc2bc/13438537310.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/58154722189.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/18852005199.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e7011a92f4c6bdbf77e59e61b06e3f2a/68182381531.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/95040351420.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/31759412837.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/sitewomorebo.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/ziwaromusozijakilix.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/35286296716.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/64351424124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=t+mobile+cell+phones+without+contracts+for+salePDF 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_off0000eebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 11036 bytes
SHA-256: d722c2430fb63464d896023499217a1f731f7ab13578b8d0f1c112f6ae70c50b
font_02_sfnt_off00012020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12020 17916 bytes
SHA-256: 112800001871ee45aad63e3448cb0fbfacda588e98a8dc339d330eb31d00d99b