Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7dd4d6399d6e3c…

MALICIOUS

PDF

72.8 KB Created: 2021-03-10 10:02:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d043cd37e1b45de67070170528dd4930 SHA-1: 7ddea9f309e9b32d3dd720463539b730143add8a SHA-256: 6d7dd4d6399d6e3ce66dd9baeb030e0430c9b779f014e748427848659195c942
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The primary malicious URL identified is https://mezovuduw.ru/strik, which likely serves as a redirector for phishing or malware delivery. No scripts were extracted, but the PDF structure and numerous external links point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/strik?utm_term=tensor+calculus+made+simple+taha+sochi+pdf PDF link annotation
    • https://cdn.sqhk.co/jawefujivi/gcsjhcs/hideaway_hills_carryout.pdfIn PDF document text
    • http://prostotit.site/what_are_the_6_elements_of_graphic_designkud2q.pdfIn PDF document text
    • http://wajulosuju.22web.org/zugemonubes.pdfIn PDF document text
    • http://salonvarna.com/38165373852q6qif.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/ohfkieQ/kesulitan_belajar_membaca.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/iihfgfm/40817248607.pdfIn PDF document text
    • https://cdn.sqhk.co/tidelefuzin/sfhbTjc/22157874449.pdfIn PDF document text
    • http://uspeh.icu/69408950119ed8x1.pdfIn PDF document text
    • http://espaceclient-cmb.com/digilunowelobojodafezuxir90jbq.pdfIn PDF document text
    • http://job-finder.space/how_much_does_a_warranty_deed_cost4v0rc.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/ed1e27ea-caea-4a3b-b951-9b877e43bcc2/how_accurate_is_wrist_bp_cuff.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_b79bd17b33484f449cc40bb49a219a8d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05f1e8ce-af7c-4839-97d6-e8a74b693b11/serial_de_oro_windows_8.1_pro_2020.pdfIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_5571c82a27444f4ba94c49b76875156f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd939e49-b930-4609-886a-c64af295338d/formato_de_carta_poder_en_word_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a5c163-e9cf-4651-9fe0-e7f0933fe03a/wokozirupinuno.pdfIn PDF document text
    • http://wobemiko.epizy.com/99971849268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f25ac9b-5b35-487c-82a0-29855722dbea/how_to_avoid_uti_after_sex.pdfIn PDF document text
    • http://tunarijog.rf.gd/jurenalulerawexagesuw.pdfIn PDF document text
    • http://pesivosemero.epizy.com/nakadudukivuzojesat.pdfIn PDF document text
    • http://xexokutofopo.rf.gd/pogabezinifuzuloranomu.pdfIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_bb092e19c7a04f5ea7ff2c1e4bd4e85f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/549e9a5d-99be-40b9-8dad-a77f5c755cc0/58826237673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9356db-2b55-4658-8244-57dd236862b5/56309070982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac03e95a-97fb-40a8-bba6-5f484d8f870b/does_uncle_sam_represent_freedom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d0f65cb-4267-44b4-a590-c68dcae091d0/23889538809.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_off0000e046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE046 5344 bytes
SHA-256: 29fe8f47b335496692837ae0cb2d57352ae4f4f403f1e5f7aea57384189932c3
font_01_sfnt_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 10244 bytes
SHA-256: 4a2955018adcd3dea0e51ed8f864b7192a051bb6f5aef3bf343d15b0aa85e3f2

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