Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36d1c909262791a…

MALICIOUS

PDF

82.7 KB Created: 2021-03-28 02:35:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffb458d6c699326c7a9cf0ae74b8e7c0 SHA-1: d2f3621cd7be2c199743e04454da063eb629e225 SHA-256: d36d1c909262791a585736cd1c555b1367ea1ba4e67410e9f66209f44caaa6ac
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one prominent URL being https://zajinet.ru/strik?utm_term=the+watsons+go+to+birmingham+summary+chapter+11. The document body, though heavily obfuscated, suggests a lure related to 'The watsons go to birmingham summary chapter 11'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://zajinet.ru/strik?utm_term=the+watsons+go+to+birmingham+summary+chapter+11
    • http://mavito.online/llama_380_gabilondo_y_cia.vitoriaeijxd.pdf
    • http://servempieza.site/statistical_analysis_with_r_for_dummies_cheat_sheetddzbx.pdf
    • https://cdn-cms.f-static.net/uploads/4453108/normal_603f8948e0da4.pdf
    • http://3-bureaureport.info/78698706197wtbyc.pdf
    • https://cdn-cms.f-static.net/uploads/4405922/normal_60557a901991f.pdf
    • http://netzamka.ru/infinity_pool_imagesfwcnm.pdf
    • https://cdn-cms.f-static.net/uploads/4412758/normal_6011e69eac4ae.pdf
    • https://static.s123-cdn-static.com/uploads/4462354/normal_5ffeec8571f2b.pdf
    • https://cdn-cms.f-static.net/uploads/4411219/normal_60581603528bb.pdf
    • https://static.s123-cdn-static.com/uploads/4490244/normal_5fc6206cd44d8.pdf
    • https://static.s123-cdn-static.com/uploads/4491945/normal_5ffa9632258ea.pdf
    • https://static.s123-cdn-static.com/uploads/4420930/normal_5ffb8549930b4.pdf
    • http://bossyonlinex.com/470749588337gukb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://78f121e6-5824-477f-9480-4bf23eba804c.filesusr.com/ugd/9564ad_23098560262d4433a77343f54e4b4919.pdf?index=true
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_5066d272068b41faa71b86db2d49dbc3.pdf?index=true
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_dc3cfb8bb5ec45e8be8a24482fbb6772.pdf?index=true
    • https://s3.amazonaws.com/poguvelefa/persona_4_boss_guide_gamefaqs.pdf
    • https://s3.amazonaws.com/fekazudabo/artificer_gunsmith_5e_guide.pdf
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_5b5a04052cfc455e9245ba466fe2062f.pdf?index=true
    • https://43466d02-873c-4564-b63c-f2f79aa6d38e.filesusr.com/ugd/fd64e8_0a25a56451a645759f800e588b978299.pdf?index=true
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_650252f4d89d40539edafc2c797aad15.pdf?index=true
    • 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_off000103da.bin
c99991ce590ecd5de12a0aa345440bac0101780e7d286b4bb0ed3bf86664053d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DA 5652 bytes
font_01_sfnt_off00011705.bin
8f34aad774a1407929b1ecbefe29998f10efa4e1830b298cea22ff06c6e35be4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 10444 bytes

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