Malicious PDF — malware analysis report

Static analysis result for SHA-256 463b25893c6ac1df…

MALICIOUS

PDF

84.8 KB Created: 2021-04-04 08:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f24993cae84f9a89a0a4ff396290ec77 SHA-1: bda002ee89e20e0264c66636127da36a70c91795 SHA-256: 463b25893c6ac1df10100abb76699afbd3c1fb8f014b91679a5a8747fdfe9112
134 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one pointing to 'resalured.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://resalured.ru/123?utm_term=answer+machine+greetings+sample PDF link annotation
    • http://luminar3-download.xyz/kuvofozeweck27u.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/hicZ6Uy/83832162387.pdfIn PDF document text
    • https://cdn.sqhk.co/jijubexovoz/ha9gfng/finding_common_stock_on_balance_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/mowuseparap/bjeS2RO/rise_up_andra_day_lyrics_and_chords.pdfIn PDF document text
    • http://originalhallyu.com/934104810407uglg.pdfIn PDF document text
    • http://nevozepamuj.iblogger.org/45051484811.pdfIn PDF document text
    • http://securityverifiedservices.com/here_richard_mcguire_read_online8mp7o.pdfIn PDF document text
    • https://cdn.sqhk.co/worijekegir/hIbKigf/3861585291.pdfIn PDF document text
    • http://itgermany.net/el_diario_de_greg_5_pelicula_completa_en_espaol_latinoigktb.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/rVMhgii/zitava.pdfIn PDF document text
    • http://life-news.tech/43277322650ofy4s.pdfIn PDF document text
    • https://cdn.sqhk.co/likafupat/jhdiiib/25351890112.pdfIn PDF document text
    • http://sayfelengs.space/washington_state_football_roster_2018k9u1t.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/3852e003-88e7-4ab1-9dfd-df9e8e0d6865/how_do_i_contact_walmart_ethics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61fbe1c0-e360-47e8-8588-949f7c4e2adb/is_hyperbole_a_rhetorical_device.pdfIn PDF document text
    • http://vegozamefokim.rf.gd/41399263157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e123f9f-f477-441f-912b-6ab9373beb66/msi_z97_gaming_7_cpu_compatibility.pdfIn PDF document text
    • http://sokexodine.rf.gd/aviation_capital_group_annual_report_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a0355e-b1cc-4787-867e-11786b9345f7/critical_analysis_of_an_article_example.pdfIn PDF document text
    • http://tolitaxolumupu.rf.gd/44002227029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d9249ea-e49b-4740-8e19-4e92204e84be/nulupozi.pdfIn PDF document text
    • http://solobasoridevel.epizy.com/sisoxovuremitazamar.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_off00010cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEF 5428 bytes
SHA-256: 08934ced65cad02bb156568203e4354e3c5ebe5efbe76c0b6c9028444f1082de
font_01_sfnt_off00011f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4A 11316 bytes
SHA-256: 9fb6e3c522d8d69840572cefb1a5c3240c40f0de9dbd40cd712267d673e89fa3

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