Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9891ce3797ddfe…

MALICIOUS

PDF

76.3 KB Created: 2021-03-14 10:15:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 95dd75391471e2cdd9db38fb8567ce80 SHA-1: a64d8fe35311325a25ce0b6e10354e97ee4f0746 SHA-256: 0b9891ce3797ddfe98dc2403695be1e976747881f8d3d5380ec65ecc27d5ce62
126 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to 'seumenha.ru', a domain flagged as suspicious and associated with a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs suggest a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=clockwork+princess+series+in+order PDF link annotation
    • http://bojidodug.iblogger.org/free_printable_math_worksheets_for_3rd_grade_division.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448719/normal_602d9f1fd48be.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/jcjjige/43040339691.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474218/normal_6028bc6f21498.pdfIn PDF document text
    • https://cdn.sqhk.co/zufutetuwume/VUhiibQ/48812429015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_60403c5dc56b4.pdfIn PDF document text
    • https://cdn.sqhk.co/ziriziwebu/gg7ha6k/gopro_session_4_red_light.pdfIn PDF document text
    • http://gosejoligezo.iblogger.org/computer_programming_languages_salary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491671/normal_6009d1a0242d6.pdfIn PDF document text
    • http://salukapebuke.iblogger.org/bemer_matte_information.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366351/normal_5fc8456baed97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_604d5e7c8f2c0.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/kij6hbk/dutifavol.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/limepusotanal/fahrenheit_451_part_2_vocabulary_review_answers.pdfIn PDF document text
    • http://lironif.epizy.com/invitation_letter_china_visa_template.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/nuwir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ea4e300-4a66-449e-b42e-16dd2fe6c304/vegetarian_side_dishes_for_thanksgiving_dinner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aac1b7c-6b13-4aac-aa20-bda01dc178fd/tukapubuteduxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ca49cd-a55a-4944-91a6-b9109e79d248/18915222613.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/goodwill_donation_value_spreadsheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2889d429-b65d-48c8-9c51-a4a75f9b3d8f/samsung_un60fh6003f_no_picture.pdfIn PDF document text
    • http://pukokudew.epizy.com/maytag_quiet_series_300_dishwasher_manual.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_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 4916 bytes
SHA-256: 4cc9c90dba4477579b42ca3e7c8fcc12321522f7e929e057a47e62c5128ffe91
font_01_sfnt_off0000fee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE2 10836 bytes
SHA-256: cbae5a4139b28c149df618721db6652537200d6499041d697cd0375ae309be42

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