Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0296ac3f1517b65…

MALICIOUS

PDF

105.4 KB Created: 2021-03-26 07:46:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ea3fc3967f1d8c5aae8d397dd92da39 SHA-1: bad036c33c49124020c85f830dcc4b103a9c2bbb SHA-256: a0296ac3f1517b6520fdd2bce2138d0ab2d4bab3054dac03b4d04be400b436ee
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of external links, many of which point to unknown PDF resources, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate an attempt to distribute or link to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/wix?keyword=miller+and+levine+biology+online+textbook
    • http://losmopaka.site/depois_de_auschwitz_mobiz6kbp.pdf
    • http://simultaneously.space/80084421520avryg.pdf
    • http://sdfafq.info/fazapupofukufodiwei1nox.pdf
    • http://evatopshop.xyz/reading_celsius_and_fahrenheit_worksheets991cq.pdf
    • http://beririka.scienceontheweb.net/triangle_congruence_test_answer_key.pdf
    • http://persequenteamsohbet.com/pujopavowylye.pdf
    • http://romeoplanet.club/hp_designjet_5000_42svd5j.pdf
    • http://fasekafalig.scienceontheweb.net/how_to_clean_ariens_snowblower_carburetor.pdf
    • http://santand-es.com/63061747939lrf10.pdf
    • http://creditscorerepair.info/bose_soundlink_revolve_manualh8vz1.pdf
    • http://itanto.space/softest_most_breathable_sheetsgmwu6.pdf
    • http://fionainthefield.org/wakutajq3ggx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zozofufulolig/essential_further_mathematics_textbook.pdf
    • https://s3.amazonaws.com/wukara/report_writing_format_in_english.pdf
    • https://s3.amazonaws.com/padanivozeb/small_business_contingency_plan_template.pdf
    • https://s3.amazonaws.com/faxaxos/dunujinojisukozenelolipab.pdf
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_f9a5d59935bb4f6686423fdd6a351376.pdf?index=true
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_62f0c2f235374a2d9ebd8010fb50336f.pdf?index=true
    • https://s3.amazonaws.com/sabobenuwe/parirodi.pdf
    • https://s3.amazonaws.com/tibanepoxilibud/descargar_google_chrome_apk_para_ios.pdf
    • https://s3.amazonaws.com/towakog/10587097228.pdf
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_bd07399aa1e4465daf8ca6307fe251ed.pdf?index=true
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_f148f071ee634359801d39875e12feec.pdf?index=true
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_64d5b157cd3342b693b4d2189b39124f.pdf?index=true
    • https://s3.amazonaws.com/kavalukato/sims_4_athletic_career_track.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000159fc.bin
02400d9f1bcfd366051526e7d03333ec701670020206f8486341904558b94e47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x159FC 5256 bytes
font_01_sfnt_off00016c02.bin
2b2b43c7e79540017112ab08d17fdbc535be0c74f8f362e6d6cc470131259483		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C02 12764 bytes

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