Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4df339bca1a0fff…

MALICIOUS

PDF

83.1 KB Created: 2021-02-27 16:44:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8ae9da78cb50622f5331842cbc78a195 SHA-1: 9e25882f880a28c0acf6b4c2e34c01e63306e8ee SHA-256: b4df339bca1a0fffe405fb6fc648a45836ee00cd44d797e35ef7ff52584d61a0
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. The embedded URLs and the structure of the document point towards a phishing or malware distribution campaign.

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://druttle.ru/wix?keyword=3d+aim+trainer+unblocked PDF link annotation
    • http://xuzerujagojagip.scienceontheweb.net/ximejewedifaz.pdfIn PDF document text
    • https://cdn.sqhk.co/lamijaluxeso/0j4C7KA/janufiwekugul.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/the_fisherman_mourned_by_his_wife_summary.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/westpoint_home_electric_blankets.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/tilemexuxevun.pdfIn PDF document text
    • http://verifiedbadges-form.com/horde_leveling_guide_55-_602aa6e.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/EBtjfX9/debexer.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/89632878279r9w0r.pdfIn PDF document text
    • http://biolinkus.me/how_to_fix_an_ipod_nano_that_wont_turn_onyzq9d.pdfIn PDF document text
    • http://verenica.net/form_b_pakistani_passport1yx67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465685/normal_5feea7f6490ec.pdfIn PDF document text
    • http://okstore.info/83700166062med80.pdfIn PDF document text
    • http://hihikane.space/how_to_bake_in_a_presto_electric_skillet11zzb.pdfIn PDF document text
    • https://cdn.sqhk.co/xagogudexo/ivzXhbn/rare_blood_types_rhesus.pdfIn PDF document text
    • http://lavka-karamel.ru/power_bi_interview_questions_for_3_years_experienced7imd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414332/normal_5fe9388ae35cb.pdfIn PDF document text
    • https://cdn.sqhk.co/fefoseto/jAvUwib/indeed_job_search_appleton_wi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000109f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 5180 bytes
SHA-256: e87ff4cad88d97078a72b6192b62323d97e85ccff17561df65c4d0e32bec2e53
font_01_sfnt_off00011b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 10412 bytes
SHA-256: 7be7e42e4df1eabd2aa03b2d5b99ddbc00fb227959d3eabbbe4d3c0108e53b21

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