Malicious PDF — malware analysis report

Static analysis result for SHA-256 7709ed534078e9b7…

MALICIOUS

PDF

72.7 KB Created: 2021-03-12 01:51:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 229583862f81c647fd1b3863cf06927e SHA-1: 7484548448c24e0e53add64719e008941c405789 SHA-256: 7709ed534078e9b7ae6731c9794633c04ff680a622dc104fe462b00bfca08db4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://baarspo.ru/wix?keyword=anger+of+stick+4+apk+mod'. While no scripts were explicitly extracted, the presence of numerous links and the ML classifier's high confidence score suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/wix?keyword=anger+of+stick+4+apk+mod PDF link annotation
    • http://gufopitasuwo.22web.org/how_to_answer_are_you_working_today.pdfIn PDF document text
    • http://gedirobidepud.scienceontheweb.net/ge_4_device_universal_remote.pdfIn PDF document text
    • http://dobogoj.iblogger.org/61701677817.pdfIn PDF document text
    • http://boxoxele.22web.org/78726864.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nakarajibap.myartsonline.com/pdf_buku_agama_hindu_kelas_12_kurikulum_2020.pdfIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_16962dd831374c2da4b5e226ceec1849.pdf?index=trueIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_da9d8dcdf9a543c7ad796a43fc59c6a2.pdf?index=trueIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_c50ac4782c81438e8505ad7aadeba385.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/leributafa/terminating_employment_letter_template.pdfIn PDF document text
    • http://karatufi.epizy.com/walking_on_air_song.pdfIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_9d9de69a254a4522958eb3c4cbb41c1e.pdf?index=trueIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_1a91534bd7994ccbbecc8960f0537b5c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wejuvono/google_sheets_column_width_too_small.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/don_t_piano_sheet_music.pdfIn PDF document text
    • http://bikaduwixunu.epizy.com/what_are_positive_behavioral_interventions_and_supports.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/a_que_se_debe_el_zumbido_en_el_oido_derecho.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/mobogenie_for_windows_8_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE062 5584 bytes
SHA-256: 78e09159fa29a8201b4534de021e4d1e4ee93fe21572d2274fe450d3b3a4cbe2
font_01_sfnt_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 10100 bytes
SHA-256: b5145e3377d74709bac0c6fcc984f05319720c0cf939da750d3dc13c32994811

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