Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad3c09d2e4e00e4…

MALICIOUS

PDF

81.4 KB Created: 2021-05-06 17:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffedfcca4f5d0a67c7dba2cc152fd92f SHA-1: 717d151b21581085c78e12a5285b098452d994d8 SHA-256: 7ad3c09d2e4e00e47b4099c03f21f88519c67eca62f827561f5f3b279a2a23c3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one pointing to 'https://jacksth.ru/strik', suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection to malicious sites or the execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/strik?utm_term=what+emojis+do+guys+use+when+they+like+a+girl
    • https://cdn.sqhk.co/kemomonil/deiaFfA/snappy_tomato_pizza_menu_west_union_ohio.pdf
    • http://dfds.in/maiden_voyage_sea_of_thieves_key_locationikmuo.pdf
    • https://cdn.sqhk.co/pigajifaw/ig1BMih/european_history_memes.pdf
    • https://cdn.sqhk.co/fasisela/5UYic6I/followership_meaning_in_nepali.pdf
    • https://cdn.sqhk.co/nufomewo/bdXMibn/77693919360.pdf
    • https://static.s123-cdn-static.com/uploads/4497344/normal_5fcaa966c37d1.pdf
    • https://cdn-cms.f-static.net/uploads/4391893/normal_602143f3bea8c.pdf
    • https://cdn-cms.f-static.net/uploads/4455197/normal_605bc2c8ea03e.pdf
    • http://busivel.xyz/libro_de_caracteres_chinosuvgu1.pdf
    • http://cupe1.ru/sakewudupenigink2v6e.pdf
    • https://cdn.sqhk.co/bureruverog/i423Nhj/wasakaz.pdf
    • http://gloslides.com/difibak5v7p.pdf
    • https://cdn.sqhk.co/zasokolof/mjeC5gf/glasswire_data_usage_monitor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_b12efd11e5994ae4a51e231d89ff8046.pdf?index=true
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_a7143548e63148ffa345f78329dd0fa8.pdf?index=true
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_8f1aef2c8f6c4781878fdeab728fd62a.pdf?index=true
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_6486d7c14139435f95867a1091212c04.pdf?index=true
    • https://s3.amazonaws.com/xafaxotaful/call_recorder_for_iphone_apk_free.pdf
    • https://s3.amazonaws.com/rakabexozu/vijuwunevemubed.pdf
    • https://s3.amazonaws.com/fogibi/subordinate_conjunctions_worksheet.pdf
    • https://s3.amazonaws.com/roxawo/vizagutazopujo.pdf
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_4e3a3b674634421e89b0f5673cbdde30.pdf?index=true
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f127.bin
b04dbb88d44bae5385586c5c6ba6f5f22c4e896ce62152c371481e8f30f2a82f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 5468 bytes
font_01_sfnt_off000103ba.bin
fda5cc805566c0c87b57456fd571c12e339a7f8f895261bc73af5e78cdeba076
pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 11164 bytes
font_02_sfnt_off0001299a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 4324 bytes