Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b91488f1b8df277…

MALICIOUS

PDF

70.2 KB Created: 2021-03-19 13:38:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e67f3e67c5b6faaa042d61090e61b005 SHA-1: bbe95ed2b30fa25cf9759dc80f0fd68d9b4d3bad SHA-256: 2b91488f1b8df27772058bd6e20508dbcdc77cdf492aa184ac063fbf366b2f87
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary suspicious URL being https://pelibifir.ru/wix?keyword=section+2.5+solving+compound+inequalities+answer+key. The PDF's content, though heavily obfuscated, suggests it is masquerading as an educational document to trick users into visiting these external sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pelibifir.ru/wix?keyword=section+2.5+solving+compound+inequalities+answer+key PDF link annotation
    • https://cdn.sqhk.co/fowipovoji/dhaEhaW/14167389117.pdfIn PDF document text
    • https://cdn.sqhk.co/bumajanivosi/iiE5hg3/93674887540.pdfIn PDF document text
    • http://dafiwugoxafirop.22web.org/mubiguru.pdfIn PDF document text
    • https://cdn.sqhk.co/womelage/jjbHjdY/destiny_child_mobile_game_art.pdfIn PDF document text
    • https://cdn.sqhk.co/pabopimi/ceiju07/86730596626.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/gehj3jd/defense_zone_2_hd_lite_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xefejej.epizy.com/sbi_net_bank_kyc_form_download.pdfIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_dc09968921e5429b95ce629e406f455d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/wowinabalitigexuxavoxojog.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_472590fb532f48ef84d9615a653572de.pdf?index=trueIn PDF document text
    • http://xaxelajifamukas.rf.gd/appium_scroll_page_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/bounced_check_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/biomechanics_in_sport.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8b306f8-17c6-4827-a155-aa0a78cd785c/xovaduxexuvepubagov.pdfIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_e6243965cece4e89bd8aa1acfefa9b7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/912f1a9b-53b3-49f0-9d9f-7bcab4490138/sonicwall_tz_215_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/854dee8a-5f82-44f3-b577-c110d8fcb038/how_to_reset_casio_protrek_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8145df80-1c5f-44c1-b040-5e30f866249d/can_i_return_a_tv_at_walmart_without_a_receipt.pdfIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_15aa20a860b2425fac046987ed34dd45.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_216345ec180544d0948219899e72075e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mefovu/ars_amatoria_ita.pdfIn PDF document text
    • http://vobununebufipu.rf.gd/pobovuxaribasutolaz.pdfIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_4804d72f19124807b46941ec426a1ec8.pdf?index=trueIn PDF document text
    • https://3f054cde-0430-4828-89d0-5f77035cf230.filesusr.com/ugd/d93890_65961e522a2c4ac4b75724f5e9531853.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/330e1858-dc76-4cfd-9d5a-077112681eda/16257633185.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/64614794030.pdfIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_4124a8cbb1da478083f5b0547aa195c9.pdf?index=trueIn 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_off0000d10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10E 6228 bytes
SHA-256: 194133737af730c06ac32bbd4710fed9dfee4b2d9adb79a999bd93165d623886
font_01_sfnt_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 10032 bytes
SHA-256: 08eb69f95428a1abef954bd235cbe753e384f61ac536f577cd30afb0b6c0c333

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