Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb0448efd81b2f6…

MALICIOUS

PDF

78.9 KB Created: 2021-04-13 08:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ed9eeae40ff2e5de487c946a21580141 SHA-1: d1edd4d006e196c87c20ead3b5eb9c743d8e76f6 SHA-256: 4cb0448efd81b2f6137917005fa34b289641454566e1eb7b931e01cb0f9af465
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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://golowaki.ru/strik?utm_term=romeo+and+juliet+text+act+1+scene+5+summary+tybalt PDF link annotation
    • http://static-get.top/python_2._7_exe_for_windows_10wryz9.pdfIn PDF document text
    • http://mozujana.22web.org/fibaruwadosiza.pdfIn PDF document text
    • http://gachihyper.xyz/work_energy_and_power_worksheet_answer_keywm96u.pdfIn PDF document text
    • http://fewomazojuxed.iblogger.org/jamagasumijatexidozagizos.pdfIn PDF document text
    • https://xedububedopo.weebly.com/uploads/1/3/0/7/130740082/basixir.pdfIn PDF document text
    • https://limuvowefegepud.weebly.com/uploads/1/3/4/5/134509231/dc5f6f.pdfIn PDF document text
    • http://gnfcns.info/honeywell_wireless_thermostat_not_communicatingks8ul.pdfIn PDF document text
    • http://hookup157.site/2_player_cupheadzstp2.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/tapexiw/buffini_blitz.pdfIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_2f61eb82c0aa4dc4be899cb0444e45e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najubu/lg_front_load_washer_error_code_fe.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/c._s._j._m_back_paper_form.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/non_disclosure_agreement_template_microsoft_word.pdfIn PDF document text
    • http://xidetikoximu.epizy.com/naviliwalufapagi.pdfIn PDF document text
    • http://sobuzazan.rf.gd/trasplante_de_medula_sea.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/2019_toyota_camry_trd_0-60.pdfIn PDF document text
    • http://fazavoregotula.rf.gd/92638198579.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_0939d5ad87ca4a0e91403ebb10ee94a0.pdf?index=trueIn 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_off0000f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 5652 bytes
SHA-256: bde4a5d74419dedefbf660fc244b370277464e97df1c1bc7a07cd840029adada
font_01_sfnt_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 11100 bytes
SHA-256: 9bff58acfa5c8fee64efdf0d72645132f8597facc3412da899e811c05cbb9699

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