Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9c47a865915fe0…

MALICIOUS

PDF

81.5 KB Created: 2021-03-14 13:24:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bd37e6e5e81ac6c2511162395e9386cd SHA-1: 0e502de4cdb2db0a3a67b4457472145934d74e5a SHA-256: cb9c47a865915fe051885ccd5c275b406f3d392caf4814cf021cda49253b245d
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable or unknown domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious intent. No scripts were extracted, but the presence of multiple external URIs suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://druttle.ru/award?keyword=cutting+tool+materials+properties+pdf PDF link annotation
    • http://vomimaforotagi.mywebcommunity.org/wozavabomopikelogoguz.pdfIn PDF document text
    • http://banquepopulaire-fr.org/ultrafiltration_diafiltration_tffc119h.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/SahcxC8/adderall_withdrawal_fatigue.pdfIn PDF document text
    • https://cdn.sqhk.co/rosavuzezig/xha19gi/begaf.pdfIn PDF document text
    • http://newyearshop.site/14788139211weknd.pdfIn PDF document text
    • http://ketenimolupev.sportsontheweb.net/general_zoology.pdfIn PDF document text
    • http://tijoxuxiga.iblogger.org/possessive_form_of_family.pdfIn PDF document text
    • https://cdn.sqhk.co/dosiloxof/hiMjjjh/global_knife_water_wheel_sharpener_instructions.pdfIn PDF document text
    • http://vagokij.iblogger.org/how_much_does_verizon_charge_for_a_router.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/58334146102.pdfIn PDF document text
    • http://sakhavto.ru/719436245138467.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/igjdLkg/clock_change_date.pdfIn PDF document text
    • https://cdn.sqhk.co/wivodojeg/dShajh3/distributing_a_negative_worksheet.pdfIn PDF document text
    • http://jitokinut.iblogger.org/chandramukhi_pranasakhi_kannada_full_movie.pdfIn PDF document text
    • http://hallop.xyz/58822004395zwwqg.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/votuweroxigezog/nemozat.pdfIn PDF document text
    • http://dufovufozotetan.epizy.com/adding_decimals_worksheet_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/abandoned_farmhouse_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/64435180997.pdfIn PDF document text
    • http://vujiwexamofone.rf.gd/classifying_matter_concept_map_worksheet.pdfIn PDF document text
    • http://kofokof.rf.gd/to_kill_a_mockingbird_chapter_17_quotes_with_page_numbers.pdfIn PDF document text
    • http://pitefabe.epizy.com/24995134815.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/towepimobularilir.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 5268 bytes
SHA-256: c6713de206c4d0b53e05883a18db807805be9b2ca40e0fd54ffc95810413698c
font_01_sfnt_off000112b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B5 11108 bytes
SHA-256: 197cf5a9d67a82fc4b74033073cec2ce9a779170d6b2d1fdbb99c2d2506d81b7

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