Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe64bcff1d4726b9…

MALICIOUS

PDF

76.0 KB Created: 2021-02-25 23:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 18ddc26b4c3f40a1266029c60112b626 SHA-1: b836188234df500c99f594884fb228771337226d SHA-256: fe64bcff1d4726b966c9cb844704ec4498a7c5970de061e2e2caadea8414ebc5
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URIs, with one specifically identified as an external URI pointing to 'https://leonvi.ru/123?utm_term=reiki+master+training+cost', suggesting a phishing or malicious redirection attempt. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=reiki+master+training+cost PDF link annotation
    • https://lotetirupaxep.weebly.com/uploads/1/3/4/0/134013035/e53e1602eb6.pdfIn PDF document text
    • http://trendmobile.ru/hp_deskjet_2541_all-in-one_printer_copier_scannerf3obx.pdfIn PDF document text
    • https://nofabirudop.weebly.com/uploads/1/3/4/4/134455392/2e9e40.pdfIn PDF document text
    • http://srakan.space/how_to_update_a_mobile_homelahbz.pdfIn PDF document text
    • http://sfr-webmail.com/17786405280q9h55.pdfIn PDF document text
    • http://amst-watch-v2.club/abecedario_ilustrado_para_imprimircg64i.pdfIn PDF document text
    • http://torchland.xyz/78507358296s090x.pdfIn PDF document text
    • http://zovizakuxefo.iblogger.org/final_report_card_comments_for_high_school.pdfIn PDF document text
    • https://wumezovavupod.weebly.com/uploads/1/3/4/7/134741594/0df3e04506c47.pdfIn PDF document text
    • http://sayfelengs.space/xelonisunubidanezimesadx023.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/67214868809gyxpp.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/mudurixo/kayamat_serial_star_plus_song.pdfIn PDF document text
    • http://xuxixezatazifax.epizy.com/dekulakekiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/believer_kaskade_remix.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/anker_soundbuds_rise_manual.pdfIn PDF document text
    • http://jigiwema.epizy.com/asus_graphic_card_driver_windows_8.pdfIn PDF document text
    • http://magivaxinel.rf.gd/decimal_place_value_worksheets_with_answers.pdfIn PDF document text
    • http://logapazop.rf.gd/adobe_actionscript_3_free.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_off0000ebd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD5 5156 bytes
SHA-256: dc3e6bc6610bda2d675e81156f274fb824591927df00a9c95c264d73817d4c8b
font_01_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 11140 bytes
SHA-256: 99956d21bd943db44749e30add386c20304492f632946ef9e89102800cd7b9f4

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