Malicious PDF — malware analysis report

Static analysis result for SHA-256 458fa0537b2afca9…

MALICIOUS

PDF

75.5 KB Created: 2021-03-23 10:31:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8f4ced573e053821f778f6424f772f8b SHA-1: 7b5be5e51f023a6acbafaf0233d05ebd325d260e SHA-256: 458fa0537b2afca915c77e6adb5811f383f5fcf96b1301ef9296f40c77ff6b46
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest an attempt to redirect the user to a malicious site.

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://jacksth.ru/strik?utm_term=the+assassin%2527s+blade+page+count PDF link annotation
    • http://berabufepibaj.iblogger.org/certified_agile_project_manager_salary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473340/normal_604f92cd8ebc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_6052d30368e36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416143/normal_5fc87b96ac745.pdfIn PDF document text
    • http://fofesivolu.iblogger.org/pefonupifoxalelokixutagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476595/normal_602ba21b0f6d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_60394c92047a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d7a941f-293f-4b60-a9b7-ce3280f39eec/zuxipixotavikulixamer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54433252-5e43-4452-ba1b-d4f0542e87cb/43830754265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdbfd1c3-8fec-49fc-8027-db4cee0b7dab/how_much_do_primerica_reps_make.pdfIn PDF document text
    • http://davojuke.epizy.com/beretta_92x_performance_pistol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cefad24-57ce-44bc-bf33-c27660c26b09/why_is_act_1_scene_4_important_in_macbeth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c4d4d7f-7591-477a-acc1-1bca52631ed6/how_to_type_latin_letters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666568c0-a416-4ffb-b6a6-2c4d0565a8aa/figurative_language_in_the_giver_chapter_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f82e76e-1eeb-41fe-9e5b-3067bca80113/conversion_de_pulgadas_cuadradas_a_metros_cuadrados.pdfIn PDF document text
    • http://kogisovaf.epizy.com/27436081032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c73731e-2e21-4884-a310-9568378dffaf/66710928986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c68cb1d-368b-4577-b487-6cb8591479f1/but_its_a_nice_dream_lyrics.pdfIn PDF document text
    • http://limuzanesaz.rf.gd/porter_cable_150_psi_air_compressor_leaking.pdfIn PDF document text
    • http://fozufululuk.rf.gd/automation_in_apparel_industry.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/48465381385.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/65685854286.pdfIn PDF document text
    • http://zonuwugi.rf.gd/algebraic_geometry_and_commutative_algebra.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_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 5364 bytes
SHA-256: 413dc458cd2668365fbee2928b3312e205e1c482606462fa4e0c861c575e6786
font_01_sfnt_off0000fb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB84 10864 bytes
SHA-256: b811f8efeb2b8e8fd657ae7be9420ca03e851ca6595511cb50f0ad26aa53f697