Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3b596c6f7538f0…

MALICIOUS

PDF

79.8 KB Created: 2021-03-01 21:06:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5251d8685da2955ae7765e0f463d6d25 SHA-1: 4756542d821558dcc0c9efa543581fc3e5aca745 SHA-256: ba3b596c6f7538f041c35e9de25a2769dd9e625274ea4501412a438fcf473b08
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a mass of external PDF links, with one pointing to zajinet.ru, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/aws?utm_term=history+of+the+cheese+ball PDF link annotation
    • https://nojoxarojip.weebly.com/uploads/1/3/0/8/130813855/5788782.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xeroguru/taxabut.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/87719633525.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/kevonimexedutoxejakirama.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/certificato_di_conformit_edilizia_e_catastale.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/all_chucky_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/alfabeto_hebreo_antiguo.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/anemia_mukt_bharat_operational_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/roxirumever.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/68368034369.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/answered_prayers_truman_capote.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/def_classified_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/avancemos_1_workbook_page_30_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/free_editable_powerpoint_world_map_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/gedadodit.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20D 4856 bytes
SHA-256: 6b805575c77ea52e3f18724ae01456ab6910fbb885e9712e70c15bc239d30774
font_01_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 2604 bytes
SHA-256: 03562acdfb6a598809fda3080e290c2c5e4819e223d274b6462cdfcec7cd1305
font_02_sfnt_off0000fded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 11284 bytes
SHA-256: 53ad0d5d8eebd97b994d43e242c597bf33994eb7c26efb9753a66ca25de8827c
font_03_sfnt_off000123df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DF 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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