Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2b5c7192520e89…

MALICIOUS

PDF

62.4 KB Created: 2021-03-14 16:06:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e2b66684a6b335e1293ec4a105696a15 SHA-1: 7d2b1dfb99d21fbb4a90ff68b3ef7a0d3d441b11 SHA-256: 4e2b5c7192520e89e4cbb4c43bdf1bec058434c03b59206294ebe78fb33e548d
184 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, and is flagged by multiple heuristics as a link farm and potential phishing or malware distribution vector. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the structure suggests it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://zajinet.ru/strik?utm_term=nutribullet+rx+recipe+book+pdf PDF link annotation
    • http://present-mag.ru/elunevision_reference_studio_4k_tab-_tensioned_screen_reviewktw5e.pdfIn PDF document text
    • https://serudifatu.weebly.com/uploads/1/3/5/3/135324897/ludano.pdfIn PDF document text
    • http://ru-en.xyz/total_health_clinic_listening_answers_test_2uzx7q.pdfIn PDF document text
    • https://peletawipimo.weebly.com/uploads/1/3/4/4/134444154/b9e0bba3.pdfIn PDF document text
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/a30002.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/bomegubo_mowabowirusozuk.pdfIn PDF document text
    • http://ashotik.space/geography_map_grid_worksheetsd9216.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_6e15564259f345bd899c5c0cf3cd70b4.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_a318539e67fb469a980498f2dab5d132.pdf?index=trueIn PDF document text
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_7904947bc74d433a87c8259b368a8aa6.pdf?index=trueIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_50de9d5bd6c24ce586cd0457d680b5de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/barbie_makeup_game_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/magapimiporaberusojij.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_691b7bf69e0c49bc9051dea17bf64f0e.pdf?index=trueIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_6f2404d832c846a6855704d7e72b5f83.pdf?index=trueIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_38a350a2452c4ae68491132b5529bd33.pdf?index=trueIn PDF document text
    • https://c38d9960-f3a4-46a0-b266-cfc7836dd0ed.filesusr.com/ugd/a8d9c8_12145954e38b40e887445b5e84851ab2.pdf?index=trueIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_11940a99baff464dadd07bfd32b16fa9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/climate_change_effects_on_agriculture.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE898 5000 bytes
SHA-256: 741ae948ce3d44d3df13fd75b9aeee7b1429af41a987af4a0e2ca882e72b19a4

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