Malicious PDF — malware analysis report

Static analysis result for SHA-256 491945b7e1520653…

MALICIOUS

PDF

80.6 KB Created: 2021-03-28 22:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b423e78e2fa75b2e48802a8093a4f625 SHA-1: ddd8f5e8494eea604af127e069a814afa58f9fae SHA-256: 491945b7e152065326639d5301e121ea8f5d0869829785dea5e8f8ded220a485
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on potentially untrusted domains. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

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 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://dugedepap.ru/award?keyword=quantstart+successful+algorithmic+trading+pdf PDF link annotation
    • http://sowitenevopad.22web.org/surah_al_kahfi_ayat_1_10_dan_100_110.pdfIn PDF document text
    • http://detonic-ro.website/bloodborne_insight_guide1fnxy.pdfIn PDF document text
    • http://nokutanebufevon.iblogger.org/time_to_answer_amended_complaint_cplr.pdfIn PDF document text
    • https://cdn.sqhk.co/ziriziwebu/2ijhdDk/movipexi.pdfIn PDF document text
    • http://yourbigdick.space/aircraft_maintenance_engineer_job_descriptionyqqx5.pdfIn PDF document text
    • http://hookup754.fun/aci_318-14_anchor_bolt_design_spreadsheetr7k56.pdfIn PDF document text
    • http://gebameguw.iblogger.org/causative_have_get.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/iaic8hj/39587989131.pdfIn PDF document text
    • https://cdn.sqhk.co/pibexezases/jdhbha5/translate_web_page_into_english_firefox.pdfIn PDF document text
    • http://gogodolajukapob.22web.org/athlone_community_college_uniform.pdfIn PDF document text
    • http://mosdendy.store/un_curso_de_milagros_leccion_374q20x.pdfIn PDF document text
    • https://cdn.sqhk.co/vemupanilow/fvhfG4M/shaolin_kung_fu_online_training_part_3.pdfIn PDF document text
    • http://kernig.store/11108403567q8a27.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_2dda74fe229a459789cf09eb096368db.pdf?index=trueIn PDF document text
    • http://zonadomafi.rf.gd/88147644313.pdfIn PDF document text
    • http://pilomewolax.epizy.com/fadurubabeladelakuxusebob.pdfIn PDF document text
    • http://puzazodigeza.epizy.com/rigefesubuwuraraperab.pdfIn PDF document text
    • http://fexagoxira.rf.gd/mabotejo.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/best_free_wordpress_themes_2019_portfolio.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/74227243587.pdfIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_2d3353d52c1144129b901d2ee837261c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kafises/cycles_of_matter_worksheet_answers_pearson.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/xozujobi.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/what_does_archery_symbolize.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_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 5628 bytes
SHA-256: fcb9d5f2f44131eeaaaf06bcf44152a7a940970df3772be7d345069910a1ecd0
font_01_sfnt_off00010eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB5 11204 bytes
SHA-256: 67bd097436bc67595b382de03197bea38da97351268aedc5f8590a1394451dd9

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