Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cf14c0e0b00dfe…

MALICIOUS

PDF

80.2 KB Created: 2021-03-06 05:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e305be331d25767ed458a31f1e586ac6 SHA-1: da8005f90f49ea1dedd9fb5b35206129d73480e3 SHA-256: 75cf14c0e0b00dfebf2c19bf7a8e1fd9949c4999bee9acb42eaeff108b8545ca
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a heuristic specifically identifying a 'link farm' designed to direct users to various PDF documents hosted on potentially malicious domains. The document body, though heavily obfuscated, includes a keyword related to freelance work, suggesting a lure to disguise the malicious intent. ClamAV and ML classifiers confirm the malicious nature of the PDF.

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://vilenefex.ru/award?keyword=how+to+find+freelance+work+uk PDF link annotation
    • http://netlysy.online/wwe_raw_results_today_bleacher_reportai4pd.pdfIn PDF document text
    • http://erogan24.website/12th_street_rag_guitarrgflw.pdfIn PDF document text
    • http://sexedate69.site/jubadoky3n0.pdfIn PDF document text
    • http://prodit.space/556429594080p2ad.pdfIn PDF document text
    • https://gemexufata.weebly.com/uploads/1/3/0/7/130739895/powaniranebegaxuko.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/b75e25fc4badb.pdfIn PDF document text
    • http://shop-you.xyz/los_cien_mejores_boleros9mcny.pdfIn PDF document text
    • http://allieshouseofhope.com/how_to_write_an_authors_statemento982x.pdfIn PDF document text
    • https://baxemajoxololur.weebly.com/uploads/1/3/1/0/131070692/ledetipifunuzi_kanodamume_mezalefajom.pdfIn PDF document text
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/7268013.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/jovekus/what_is_a_bible_handbook.pdfIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_81719f66c558477ca8239ca309afa137.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/active_listening_assessment.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/sat_test_center_closings.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/xewuf.pdfIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_98f4b4d2e68c45d18ffc6da74f1057dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/72917052585.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 4956 bytes
SHA-256: 8bcbff3fa6234b917692c867932cbe5ce309ba0e0a74ee61cc315cb01f23ec30
font_01_sfnt_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 11380 bytes
SHA-256: 780611b0b0852d61e846a8e21e58b8096a6342f4a7f07ddba3770f0b923b9df6
font_02_sfnt_off00011d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D58 16452 bytes
SHA-256: d2b7e07b7f25b8b2f45490774444232f8c84bea925c42dedeb835ff62b1b3661

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