Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb278d82267dd109…

MALICIOUS

PDF

79.9 KB Created: 2021-03-19 10:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f18169a04666852eac896eb716a4283d SHA-1: d31b888e4c24484eedef87f8dea10ee0e50be595 SHA-256: bb278d82267dd109368b66418527c96b15e05092c338f826fbf783988649b47e
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are part of a link farm, suggesting a phishing or SEO poisoning attempt. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier flagging it as malicious further supports this. The document body, though heavily obfuscated, contains keywords related to software downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/aws?utm_term=realtek+hd+audio+manager+missing+windows+7+download PDF link annotation
    • http://tamawasobo.sportsontheweb.net/hamlet_soliloquy_act_2_scene_2.pdfIn PDF document text
    • http://repochka.site/sheets_app_for_pcg5nam.pdfIn PDF document text
    • http://dorightunion.com/nezilubefalotefrmwd1.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/lexus_es300h_for_sale_in_uae.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/mini_14_vs_ar_15.pdfIn PDF document text
    • http://cmb-societe.com/chapter_20_oxidation-_reduction_reactions_workbook_answers8lhwt.pdfIn PDF document text
    • http://barbanapoli.moscow/karerufovarumuzabkr7si.pdfIn PDF document text
    • http://japamawosoj.mygamesonline.org/baldor_trigonometria.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_b9c1c71b1833490380a3524cba481ae8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/drawing_bar_charts_worksheet_tes.pdfIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/appdynamics_documentation_4._5.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_cc9151c1d3c347bcabdf1cfb73ecb7ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/besiege_game_mac.pdfIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_bf149ad805bb4e398c94cbd566aab8e3.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_a88be4f7b44e48c0be841220265e2023.pdf?index=trueIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_796d485fec7b417a8c96f979e8c68d63.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lumixi/accident_prone_crossword_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/luvavoralil.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/zubifenemolod.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/72597939431.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/15230135133.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/who_created_deterrence_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/zamekolisimixosumigasazen.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/vopekenejuxolopaw.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_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 5480 bytes
SHA-256: 7829831d129f73d88c72cb8de7a856a0faf18181b4aeec907ba759f94971aedf
font_01_sfnt_off00010e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E99 10448 bytes
SHA-256: ee95744ea3d05dd559a460a12d46d5635670ba6f9d1e4dff84266966daf9f3bc

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