Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f2e147fa7da2ba…

MALICIOUS

PDF

80.0 KB Created: 2021-05-03 04:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a53924b05466480a512d6df450438d7 SHA-1: 95710afb1a6c423f8adab6187e9afb3ebff2d119 SHA-256: 82f2e147fa7da2baa78ca80f91f32a17efd3a86186c871920ddd7b2de55fb6fb
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://dafemum.ru/strik?utm_term=second+grade+math+worksheets+common+core
    • https://cdn.sqhk.co/jufebarur/56KL7le/gym_workout_plan_for_beginners_at_home.pdf
    • http://xixapewazawa.22web.org/castrol_gtx_diesel_15w40.pdf
    • https://cdn.sqhk.co/sewadokoka/pOjcI0N/37020918937.pdf
    • https://cdn.sqhk.co/midipumep/gjihbie/wwe_raw_live_stream_9_14_20.pdf
    • https://cdn.sqhk.co/menodotitit/ghhwFDJ/45866299805.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jeromopelurab/bumakufodoti.pdf
    • https://s3.amazonaws.com/dosalapasenow/world_map_picture_decor.pdf
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_3262b51325744dc383b2a04924c8ab08.pdf?index=true
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_17c3956396da4be5ac94c75dd1783aa9.pdf?index=true
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_9bea7dea38194598821c3fc2f6c7afd2.pdf?index=true
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_8b83dc814380462eb4badc435671ada3.pdf?index=true
    • https://s3.amazonaws.com/fejififimaketo/logikegawulexilasi.pdf
    • http://lovemogifad.epizy.com/calculo_integral_libro.pdf
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_ba5e9d57045247639582afa0f508685a.pdf?index=true
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_a0cdaf4cf4f1462a9018ecf5d054ab16.pdf?index=true
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_71f292c738134cdb9eda31dbf1a95e9a.pdf?index=true
    • http://gixopefujunop.rf.gd/libro_azul_alcoholicos_anonimos_gratis.pdf
    • http://nakulugexogi.rf.gd/63573952892.pdf
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_6a0377bdb6b94934b7f7a9bc37fc9996.pdf?index=true
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_69c0bb24c2e24ee58d83bdb8e4a1d807.pdf?index=true
    • http://tajafex.rf.gd/anaplasmose_em_caes.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec27.bin
09db84293ef72d0fe4b733cd9341db2575c0ec0836e816ebfb906461c85957f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 5320 bytes
font_01_sfnt_off0000fe03.bin
14f2169444b9ca3c82c4ed9510970fe84717191e72aa222f5e7a260d70117c5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE03 11196 bytes
font_02_sfnt_off00012455.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12455 4324 bytes

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