Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97a5f9ab3f8f778…

MALICIOUS

PDF

72.6 KB Created: 2021-03-29 18:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eda79dd88e87b4eefaac02f2a530706d SHA-1: 125022502a81e3dbf7a817585633c76d27e453a2 SHA-256: b97a5f9ab3f8f77867bba2229eb723a8d5806ea2bd9ecd96aa4c31f84d94e477
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of a large number of external links, including one to 'kuzutuzo.ru', suggests a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and heuristics indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=xerox+workcentre+7855+drum+cartridge
    • http://tapodozinojet.mypressonline.com/xakiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_223d6dfa7cbc44e1a7fab7ca7de372f0.pdf?index=true
    • https://5c9c3928-af7d-4195-9e43-9647d7263c15.filesusr.com/ugd/508998_9a50913063a04cc3a17f206440a9267d.pdf?index=true
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_d5c40ab19c904f2584bcb09ea6170b19.pdf?index=true
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_982bec390bab4ea2a1a438eca3089572.pdf?index=true
    • http://junedujivoxoz.epizy.com/duvesesusadozowisobugibix.pdf
    • https://s3.amazonaws.com/tidigudetefumof/force_and_motion_worksheets_answer_key.pdf
    • http://koxowideza.epizy.com/82729145969.pdf
    • http://gonegexunu.myartsonline.com/best_albums_of_all_time_rolling_stone.pdf
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_96c6b73eb5594c928a1aa13291d40e8d.pdf?index=true
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_1e4c71fe0db3476d95369133f6ef02f6.pdf?index=true
    • https://s3.amazonaws.com/timituvupame/how_do_i_program_my_comcast_remote_to_my_magnavox_tv.pdf
    • https://f92484db-e5b4-41f8-9431-508412042773.filesusr.com/ugd/b04c15_62e27832f655422cafd1e82002862891.pdf?index=true
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_2d8267aef4c74e2f89a9b7fff9293593.pdf?index=true
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_0e2736ccffc24196a4626571918e4317.pdf?index=true
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_025a65bd1cf443ea8c6eebbd4fec5995.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc2a.bin
0a6edddee41518bf312cee1a4a0fc866d9af7477d66f99a11d37b2dd1d61a1c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2A 5528 bytes
font_01_sfnt_off0000defd.bin
85f3a8e3ab417e3aa2a04caa7e8d5e5277afb42bb18c44862102cb9b79095352		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 11376 bytes
font_02_sfnt_off0001058b.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 4324 bytes

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