Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7cd111b5c3657e…

MALICIOUS

PDF

86.5 KB Created: 2021-04-05 01:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28ed75e629cbfabe1f70dd39d2f86e2a SHA-1: 1220de6e70f3408dfa48f86cd1d94e52df3e6182 SHA-256: 7a7cd111b5c3657edba57e38cdfc088d45564e7c71756471d09dfaa2cfde9585
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one pointing to a suspicious domain ('nipisod.ru') and another to a potentially malicious PDF file. ClamAV detection and ML classification strongly indicate malicious intent, specifically phishing. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=short+historical+fiction+books+for+3rd+graders
    • http://svarka-aurora.online/fafepunasiriluvofoxu3ldvw.pdf
    • https://cdn-cms.f-static.net/uploads/4484156/normal_60221772e3d39.pdf
    • http://souve.me/protocols_used_in_tcp_ip_models3kkl.pdf
    • http://storeyou.store/gesodufizigasusorfmcbj.pdf
    • http://geosen.net/85540992855ga07l.pdf
    • https://cdn-cms.f-static.net/uploads/4457305/normal_603ede3a8b5fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jedaxopopuko/geometry_triangle_theorems_list.pdf
    • https://s3.amazonaws.com/nafibanefexex/maytag_centennial_dryer_heating_element_replacement.pdf
    • https://s3.amazonaws.com/bisiku/40958261770.pdf
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_bdc0f9c044884fa9be0835d24957aa65.pdf?index=true
    • https://s3.amazonaws.com/fidefofudi/28873873050.pdf
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_6d17475b97414f37b6ae6ad01809de82.pdf?index=true
    • https://s3.amazonaws.com/tokafanawa/dove_e_il_cestino_su_android.pdf
    • https://s3.amazonaws.com/povodijirig/28925560650.pdf
    • https://s3.amazonaws.com/jupevuxirapi/visual_communication_advantages_and_disadvantages.pdf
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_2ea7f5a2e8874fd1b63cad1f985dc7e9.pdf?index=true
    • https://s3.amazonaws.com/kelukakeb/police_report_news_article.pdf
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_6981013ba81543f4a29b3db682f9bacf.pdf?index=true
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_4499fe21bad740f99488d38f436afc32.pdf?index=true
    • https://s3.amazonaws.com/jazuravazaguz/miserodakovat.pdf
    • https://s3.amazonaws.com/tumasun/texinanuvejozapugo.pdf
    • https://s3.amazonaws.com/xukanomarexumu/noxelug.pdf
    • https://s3.amazonaws.com/kezemiradigu/jireragizurigelizugutol.pdf
    • https://s3.amazonaws.com/gonasidupij/baby_g_shock_manual_1564.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_off000106be.bin
3a5e29c56da095647157b12bc8e285a1f28128989afe528f1fef3ef989f0c4ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 5544 bytes
font_01_sfnt_off0001197c.bin
d5b32f5ae83f2a62ba48cce49c1e1f6f12736f30ba62857f04beb4c881affad9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1197C 10804 bytes
font_02_sfnt_off00013df8.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF8 4324 bytes

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