Malicious PDF — malware analysis report

Static analysis result for SHA-256 81521ed02981ad72…

MALICIOUS

PDF

77.3 KB Created: 2021-03-20 17:37:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3429ca139a58d6a07ecdbf5014607697 SHA-1: 5c3c9312628b5a3ec07df333d8b2846344485172 SHA-256: 81521ed02981ad728bea6e8b9ca421dea2376c306cb94ae905d06d2baae53f39
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a mass external link farm, with the primary malicious URL being https://botokaw.ru/strik. The document body is heavily obfuscated and appears to be a lure, possibly related to 'All races dnd 5e chart', directing users to the suspicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=all+races+dnd+5e+chart
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ce5901b1-280b-4dcd-90cf-9995ea11e37b/subavafonotemibekibali.pdf
    • https://uploads.strikinglycdn.com/files/a41eec74-bbc8-489e-a615-cad30e776676/zagarexudarufugeratus.pdf
    • https://uploads.strikinglycdn.com/files/d28dd329-d5e5-4659-aa66-88f364068a78/black_max_6560_generator_oil.pdf
    • https://b47237a6-1880-4d87-9598-f01162bab054.filesusr.com/ugd/1fe0ea_4363c4fd8576467db223f1e1bf44ee85.pdf?index=true
    • https://9f1be152-2ea1-4306-981d-bfff62ad382d.filesusr.com/ugd/08fb22_f1b5efbfb19340dea88c60375c93c57e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/23d70936-57ef-4bf1-bf49-4f0bc3b57da4/fefekodenagogajume.pdf
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_2a0bc1ba954e474c931f0eae4228fc84.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0a8f88f9-8a2b-4f66-adc7-b022df8abad7/superman_and_me_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/3582c099-7426-410f-81c3-127938010bd2/luxidanopaxuzodiko.pdf
    • https://s3.amazonaws.com/tanikanaw/how_to_wash_bissell_steam_mop_pads.pdf
    • https://s3.amazonaws.com/wajibile/98645301463.pdf
    • https://s3.amazonaws.com/nuxepiduded/sites_to_hollywood_movies_free.pdf
    • https://uploads.strikinglycdn.com/files/0fababe5-f995-485c-9c23-b204a01d9a2a/13378594806.pdf
    • https://uploads.strikinglycdn.com/files/23befc97-fd62-43f0-82c0-63ee0e72e9f6/how_to_use_webcam_on_samsung_smart_tv.pdf
    • https://uploads.strikinglycdn.com/files/bb798f13-6868-4b89-9927-b513ebb4f621/aqa_a_level_biology_cells_past_paper_questions.pdf
    • https://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_85da5888c57641978ea80ccfa8e500d7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/47f940f0-1ddc-485c-8ca9-973be8e53ed0/how_do_i_use_samsung_remote_bn59.pdf
    • https://uploads.strikinglycdn.com/files/3081bbb3-d1eb-4113-9bbf-88aef4d4f644/how_much_is_drill_sgt_pay.pdf
    • https://uploads.strikinglycdn.com/files/773a8a67-1c30-4959-821b-8f49c3aea5e4/39024751844.pdf
    • https://s3.amazonaws.com/tapexiw/android_root_apk_pc.pdf
    • https://uploads.strikinglycdn.com/files/efcc4b02-2847-4124-9cbe-a2641dd52231/31289817249.pdf
    • https://s3.amazonaws.com/goveruduzewoxu/61936036098.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ee.bin
477352beb9f1886dfba19283362a40d0468a5225588b0eff550a5c544969d558		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 5140 bytes
font_01_sfnt_off0001035f.bin
28e17605db7d7690ae083e78d075f7f737b947583749c23a6b8ff66cb5eab6e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 10788 bytes

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