Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b38ddee4d6581ee…

MALICIOUS

PDF

75.5 KB Created: 2021-03-29 16:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 12f8e3f81780fe5e5e85ddee6ab370af SHA-1: cb0c7efa384295443b0b3b746df9df81e876cd7a SHA-256: 6b38ddee4d6581ee0f52d145b91b3a1768e162bdef554a5c3faf8fe94c48b592
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • 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://nipisod.ru/123?utm_term=free+modern+templates+for+cv PDF link annotation
    • https://ranibifuvif.weebly.com/uploads/1/3/1/3/131381542/fovawad.pdfIn PDF document text
    • http://trikotoria.ru/using_socratic_questioning_in_teachingdf4gi.pdfIn PDF document text
    • http://ritual-venki.online/90318521996lv0yd.pdfIn PDF document text
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/wopozivemo_gojadilomo_tuwefurepowame_tapegogimuga.pdfIn PDF document text
    • https://rejukikigukaw.weebly.com/uploads/1/3/5/3/135387704/widezulejen-wipesuvozemugi-xogoxewagajol.pdfIn PDF document text
    • https://sonunupenoxomo.weebly.com/uploads/1/3/3/9/133986361/cf5e4.pdfIn PDF document text
    • https://cdn.sqhk.co/pibegufuxova/jiaehie/ben_10_up_to_speed_apk_mod.pdfIn PDF document text
    • https://bafejaligaxe.weebly.com/uploads/1/3/4/0/134018432/duzugezoziji.pdfIn PDF document text
    • https://cdn.sqhk.co/nunewole/7fUQEhg/monster_truck_soccer_3d_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_bec61b15433545a087391b29c706963b.pdf?index=trueIn PDF document text
    • http://sasisoxebejinap.rf.gd/83735327732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8abd8387-f26e-4187-8218-c6af7daea3d4/dibujos_de_rostros_de_mujeres_con_flores_a_lapiz.pdfIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_9d335e2553f044af999c667167bcb28a.pdf?index=trueIn PDF document text
    • http://jitapalerex.rf.gd/wonenodopi.pdfIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_b8c8b7cdb1d8487a998b35dda67bd0bb.pdf?index=trueIn PDF document text
    • http://defoxumaxu.rf.gd/burda_patterns_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7b8b463-2ad1-45de-97dc-c3b52de16d53/how_to_reset_a_nextbook_to_factory_settings.pdfIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_c3c41bae6ba64128a7307111152c7658.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 5316 bytes
SHA-256: 9f4ec27e9ceb7dd80057336e39273cdc730bf088a89720d7c23175ad0a5bd032
font_01_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 11048 bytes
SHA-256: f64d00405f5879b5bd403cf47d2f69d6aac68cd52f77eee9140d3c14ead92a6d

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