Malicious PDF — malware analysis report

Static analysis result for SHA-256 66883e898ab4c9ca…

MALICIOUS

PDF

68.0 KB Created: 2021-09-26 05:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c44ac0047d9df117a820902d3362b68 SHA-1: bbf9d02e5945a4223acd5f4b0c53c23c1648dbd1 SHA-256: 66883e898ab4c9cac8b5a505c0f51f3ba8dfb37f925ef04914a586d308327a90
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript stream and the presence of numerous external URIs, many hosted on disposable domains, suggest the document is designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a link farm strategy, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://smidgel.ru/uplcv?utm_term=can+you+see+who+visits+your+instagram+profile PDF link annotation
    • https://sindonis.com/userfiles/file/xiranijejodozekegida.pdfIn PDF document text
    • http://pnalog.ru/images/file/80999996663.pdfIn PDF document text
    • http://turnyras.lt/Files/file/jubunuwijozusukebaz.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147acf2d00cd---wosulutibokewij.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/43075766942.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/4994445371.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab4f05eee4---dozutaxajemusizajuga.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/pufudoxusikefojumari.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/zosuduxavazow.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/xojal.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/toloposafazudopinibafam.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/wolejekezonifuzumofa.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/12370926742.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090710471699.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/pelagiraramivokekozoper.pdfIn PDF document text
    • http://platcometals.com/images/file/67407416130.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/bezadumebo.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/zetawu.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/fagebokumigizajusujoxego.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_off0000a986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19D 11200 bytes
SHA-256: 332c89a47370e2fbd05a136f28731f524ea7ceca06cf169f1cea0ab701cea5fd
font_02_sfnt_off0000dbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC1 15564 bytes
SHA-256: d7e9b330ec6282c0f3b01deaf9c2264830d2f96e2925b41166293266793d25e2

Open this report in the interactive analyzer, or submit your own file for analysis.