Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef2211d0b16479b…

MALICIOUS

PDF

80.8 KB Created: 2021-03-23 22:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7fa603cb9c68d333001563bae7c81b5f SHA-1: 25f0a8cae323aa0c26481fefdada9221a2100e48 SHA-256: 3ef2211d0b16479bd15dda3cbc9cde0d1116c52a40eaf617e097eaf4c558e978
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are associated with link farm heuristics, suggesting a phishing or ad-fraud scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=can+i+make+my+own+oxygen PDF link annotation
    • http://buytoday.cc/alkaline_plant_based_diet2loo9.pdfIn PDF document text
    • http://cyberlife.store/how_to_analyse_risk_ratio3mfkn.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/what_are_the_best_automatic_vacuums3imcv.pdfIn PDF document text
    • http://fresh-ita.space/how_to_flush_a_boiler_heating_system30o95.pdfIn PDF document text
    • http://nakanilo.club/how_do_i_set_the_time_and_date_on_my_canon_mp11dx_calculator5i0a5.pdfIn PDF document text
    • https://gidedumewulo.weebly.com/uploads/1/3/5/9/135961218/240db8.pdfIn PDF document text
    • http://bellissimo.online/16521014574sty7w.pdfIn PDF document text
    • http://gromstroy.com/burugimasizunaruz8.pdfIn PDF document text
    • http://vereffka.xyz/23740814861r07v6.pdfIn PDF document text
    • https://povijovo.weebly.com/uploads/1/3/4/4/134463476/303142.pdfIn PDF document text
    • http://cherrypimp.online/iosh_managing_safely_4.01uukh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/fudonasurinexeja.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/dna_structure_and_replication_crash_course_biology_10_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b160aec-27d9-473b-b8e6-1c366ae21004/rigeriwuniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c7d1186-7112-4804-b0a1-8d140756d7c7/does_dunkin_donuts_have_munchkins.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/bootstrap_4_blog_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74fcdd34-7d0b-4a91-a3c6-56053d37b2b6/othello_act_1_scene_3_comprehension_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/how_to_turn_on_the_scanner.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/9799243800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a47a18-4c34-465b-83a6-39d1ecb6e34e/what_is_hr_executive_interview_questions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 4756 bytes
SHA-256: 0a8d28c1d7d6902f304340000657ff21413d4690a2f1e5f291127441704ce0e9
font_01_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 10512 bytes
SHA-256: 7294b645792ab74d894732e80bf2acfe16d8d98ed14e30165869dfcc6eac10d7
font_02_sfnt_off0001278a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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