Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f4f361bc46eeaf…

MALICIOUS

PDF

83.1 KB Created: 2021-05-12 23:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6dcdb98531b29d1f22f43242c0cdbff SHA-1: d801264475abdbd73a391bc2eacffec88e9e26c8 SHA-256: 52f4f361bc46eeaf420bfb2c9185bfe01d0ddca79af8ecb5f193210424107a5d
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating an external URI, specifically 'https://botokaw.ru/strik?utm_term=can+i+pass+cfa+level+1+in+2+months', which is presented as a question in the document body. ClamAV detection and an ML classifier also flagged this PDF as malicious, suggesting it's a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://botokaw.ru/strik?utm_term=can+i+pass+cfa+level+1+in+2+months
    • https://cdn.sqhk.co/jaxugaveg/hhs6jii/fivegorenixuzezasomage.pdf
    • https://cdn.sqhk.co/xovinexesun/ghuIigR/ketilujevojofamoxe.pdf
    • http://premiumpornclips.com/laladaloponujexebimexefeoxqrc.pdf
    • https://cdn-cms.f-static.net/uploads/4393358/normal_60493204390d3.pdf
    • https://cdn-cms.f-static.net/uploads/4377717/normal_5fdbbd6290c7e.pdf
    • http://akvatehnika74.ru/75149668510xmw2y.pdf
    • https://cdn.sqhk.co/gebijowokobe/cgfhieS/samituja.pdf
    • https://cdn.sqhk.co/wuxegejedak/jhjaChh/can_i_speak_to_the_manager_karen_gif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/regufojalojaza/10846076322.pdf
    • https://s3.amazonaws.com/desekusoxi/22755888146.pdf
    • https://uploads.strikinglycdn.com/files/6b14749c-4c74-4f33-8003-5756593a132f/hello_adele_karaoke_download.pdf
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_2feff992282d48e098aa9d663e26222d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e7dd453c-0d0d-4ffa-973f-32038af3866b/18594355930.pdf
    • https://9c3086b9-336b-4a4d-b39c-975a2563a2e0.filesusr.com/ugd/f4f792_00935b5af1954924b20350824dc5c025.pdf?index=true
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_936de2525cb643b4b7c0f296af52a314.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a73e8c18-9c01-4811-aef5-b0c451922bf0/peg_perego_prima_pappa_best_high_chair_cover.pdf
    • https://uploads.strikinglycdn.com/files/c8de1910-50b0-4508-b35d-8d9c305e53a6/is_the_covid_test_free_in_florida.pdf
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_0bc9d2f2b4154c6bb123b1fe657c8eb6.pdf?index=true
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_a61a189f32274a10b16dd95884914031.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d716038d-eca4-4282-82f5-b165d0ca27d9/pijebanatu.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_off0000f9fa.bin
5aeae3965d2b68929a10ba83ff82304a82fbcb5e2df96341e2e87ba5ac334b5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 5212 bytes
font_01_sfnt_off00010b9c.bin
551e26fb48e8ecf3e326e6deac41bb6beb9799718e7545d79d039bbb4d4b3e85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9C 11084 bytes
font_02_sfnt_off0001313f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1313F 4324 bytes

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