Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40ba34c79e3d0e6…

MALICIOUS

PDF

87.5 KB Created: 2021-04-11 14:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fc4c2c60c038ca943115668cfaf5d48 SHA-1: 6f984c5d2412073306cd4b7ec088b9ef1b2208a6 SHA-256: b40ba34c79e3d0e6c11198bfbe996d85a6e41d4ac2468f320a19e2ab8b4aae76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one prominent URL pointing to a suspicious domain ('vilenefex.ru') that is likely part of a phishing or malware distribution scheme. The presence of a large number of external links, including a 'link farm', suggests an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=is+potassium+nitrate+an+ionic+or+covalent+bond
    • https://static.s123-cdn-static.com/uploads/4493209/normal_600928598ed0a.pdf
    • https://cdn-cms.f-static.net/uploads/4453551/normal_604374b778567.pdf
    • https://cdn-cms.f-static.net/uploads/4384851/normal_6021f0161f406.pdf
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5fd0e95411f52.pdf
    • https://static.s123-cdn-static.com/uploads/4447096/normal_5ff8681cc604d.pdf
    • https://cdn-cms.f-static.net/uploads/4476273/normal_6025f2224fc17.pdf
    • https://static.s123-cdn-static.com/uploads/4470218/normal_5fe4bc1a93e19.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_58281001dd4f4bcbaaaa4e4df9e8aa71.pdf?index=true
    • https://uploads.strikinglycdn.com/files/46f6b605-00f9-4b45-bb21-5f588ab8c043/roxapadigijarunaburamisej.pdf
    • https://uploads.strikinglycdn.com/files/dd0c220f-9ddc-4770-94db-47f3c42b126c/how_to_find_the_equation_of_a_wave.pdf
    • https://uploads.strikinglycdn.com/files/008156b0-8a39-4c39-857c-1062dccbabe6/black_and_decker_smart_battery_charger_2_10_15_manual.pdf
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_d1b2c84849304a6086943e6a5e4b1044.pdf?index=true
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_34cbbc7ed65c46d8a525930f41e23049.pdf?index=true
    • https://uploads.strikinglycdn.com/files/46d8238d-8ac8-4bf2-bc4f-f0ff0bbae6ce/jack_and_the_beanstalk_short_story_ppt.pdf
    • https://uploads.strikinglycdn.com/files/505e8413-bc55-4e80-ae21-7f743d83ce19/sports_hd_dv_sq11_mini_dv_camera_driver_download.pdf
    • https://uploads.strikinglycdn.com/files/50c0db08-931d-49ca-8665-b7a04ccd4608/how_to_connect_wii_remote_to_dolphin_without_bluetooth.pdf
    • https://uploads.strikinglycdn.com/files/0ea9c02c-a279-4bf1-bfdd-9ee43b814d86/ubiquiti_bullet_m2_repeater_mode.pdf
    • https://uploads.strikinglycdn.com/files/b86b0c18-69cd-4b3e-853e-4673738d43e0/19414656523.pdf
    • https://uploads.strikinglycdn.com/files/fcb3d21e-fe98-467d-b561-4a1e1fa16bf9/27715500847.pdf
    • https://uploads.strikinglycdn.com/files/26729b59-4ed0-404c-abb5-e01a6e0e3ba0/wewegefugufidonixaluwuku.pdf
    • https://uploads.strikinglycdn.com/files/0d6ae98a-395c-4e3f-b133-609bf7d6721a/nurapafo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe8e.bin
7a695083f0a5fe875d7edd1116e096b5f523f565305983ff686ad003d1cba96d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 5356 bytes
font_01_sfnt_off000110a5.bin
4e36d3fc88e6f25dedc3965b95ae58b14bb6fb6ae50ae01a7f26f8e35faa725d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110A5 11144 bytes
font_02_sfnt_off000136dc.bin
df5bc0681d674d6ac1e0f4ebe41d754b6980ea36a2a788a32f420f14dc43f106		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136DC 17328 bytes

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