Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5faf955a5ffde67…

MALICIOUS

PDF

104.5 KB Created: 2021-03-16 00:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6d30834716aca994aba14245563c8d8 SHA-1: 90277be1314ebb5fdd991072ebbe4b468a3fac19 SHA-256: a5faf955a5ffde6769023ecefc1cff1f01b08f84ad0ca62b0a27401302d2a8ed
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external links, with a critical heuristic identifying it as a PDF link farm. The primary malicious URLs identified are seumenha.ru and rolapisi.scienceontheweb.net, suggesting a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://seumenha.ru/strik?utm_term=cards+against+humanity
    • http://rolapisi.scienceontheweb.net/muxow.pdf
    • http://kungfumalibu.com/osrs_dwarf_multicannon_guidelc0l6.pdf
    • http://moresukko.ru/gufatebrdllz.pdf
    • http://good-production17.site/zudazoruo9vmu.pdf
    • http://ponemofetu.scienceontheweb.net/how_much_is_a_ruud_gas_water_heater.pdf
    • http://agentsoft.space/sheex_washing_instructionsox74a.pdf
    • http://pakunobun.getenjoyment.net/japabu.pdf
    • http://jerunuju.mypressonline.com/helping_verbs_worksheets_with_answers.pdf
    • http://sidufapas.mywebcommunity.org/wahl_colour_pro_styler_hair_clipper_amazon.pdf
    • http://gajelifuluxapov.mywebcommunity.org/how_to_date_a_brown_girl_black_girl_white_girl_or_halfie_summary.pdf
    • http://arendaavto.taxi/large_format_cameras_for_sale_uklpwym.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fixararololu/livros_em_neoliberalismo.pdf
    • https://s3.amazonaws.com/wofaxil/51875037066.pdf
    • https://uploads.strikinglycdn.com/files/817c5ed1-d663-41c9-9160-8accfa313fd4/johnson_controls_a419_setup.pdf
    • https://uploads.strikinglycdn.com/files/ad6f0857-f62a-4e9f-baec-63145f9f843a/png_text_editor_app.pdf
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_9fab8324a9944fa79c0f28ce61e03709.pdf?index=true
    • https://s3.amazonaws.com/wulotugadag/allah_name_wallpaper_pic.pdf
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_a1c1f3d4038742108ed0655f47e2fad3.pdf?index=true
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_7a68ecdb694a4af8abcd665cb3c93827.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d712aaf2-6a5b-4df4-bcf8-c76da2452112/30061213798.pdf
    • https://s3.amazonaws.com/kubafezin/dedication_template_for_thesis.pdf
    • https://s3.amazonaws.com/tiduro/27997141574.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014118.bin
0fc068b96a22d9bc5cf7eb54fef7e2384416f2aae7238b1bffbbb8d3629bc498		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14118 5212 bytes
font_01_sfnt_off000152ac.bin
fac1e032ae84a5b5435be63eaef402baaf1932cb45f0e9025dd232d5a01ac506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152AC 13024 bytes
font_02_sfnt_off00017f1d.bin
bd62252ad4d678db08cf6d16681b14f9c7020f7a7c499fb0056b394e884c6b18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F1D 16072 bytes

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