Malicious PDF — malware analysis report

Static analysis result for SHA-256 5968ccf784585ccf…

MALICIOUS

PDF

72.4 KB Created: 2021-02-27 05:47:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2b098411f3682583893a65d242562a9e SHA-1: f02a37826c05df1ee4a51695c74126a1e44ad522 SHA-256: 5968ccf784585ccf91b6e8941fc4a01dea60a0029cddc22e3a8d7ad89eedc00d
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it contains a large number of external links, forming a link farm. The embedded URLs, such as 'https://gimoguvi.ru/wix?keyword=biotech+products+services+and+research+inc', suggest a phishing or SEO poisoning attack. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/wix?keyword=biotech+products+services+and+research+inc PDF link annotation
    • https://xunasumip.weebly.com/uploads/1/3/2/6/132696393/01bff.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/romeo_and_juliet_law_in_texas_2020.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/how_to_enable_console_commands_fallout_new_vegas.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/paint_by_numbers_framed_canvas_uk.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/9279451.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/1633707.pdfIn PDF document text
    • https://jabifuvos.weebly.com/uploads/1/3/1/0/131070291/f9edacded.pdfIn PDF document text
    • http://dipenoguzel.sportsontheweb.net/8352836911.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/hungry_shark_evolution_hack_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/policy_and_procedure_template_for_nonprofits.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/ruhs_bsc_nursing_syllabus_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/sahih_bukhari_arabic.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/20515759108.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/neruwogaramoronezuxadukix.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/dibug.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/convergent_vs_divergent_evolution_worksheet_answers.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_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 5240 bytes
SHA-256: 4f82aee08972e543fa4a8b3ec63ad43c4e4e03105cd714ad93946c9e248ee08b
font_01_sfnt_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 10920 bytes
SHA-256: 5a6a0390cc52afda76912e2b8c72cda07868b56a46d1f34c9765881a317db667

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