Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4e5c34b35df505…

MALICIOUS

PDF

86.8 KB Created: 2021-03-29 01:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b3802ecae1fd4b22d8896bf0480d1cf SHA-1: 7a1d38110961550fa57b23a781bc1b1f1fbe34a6 SHA-256: bf4e5c34b35df505c13825711ec0982d8a0e6b6fb0f3229bcd95fc09993a9ea5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains keywords related to budget formats, suggesting a lure to trick users into visiting the malicious sites.

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://dafemum.ru/123?utm_term=company+budget+format+in+excel+free
    • http://sungo1.space/granny_smith_apples_recipesi4h1p.pdf
    • https://static.s123-cdn-static.com/uploads/4486200/normal_5fef670f44d7c.pdf
    • http://sigonalen.22web.org/equation_of_a_line_worksheet_4_answers.pdf
    • http://clebohets.xyz/fidekesilsb9ov.pdf
    • http://dakujuzoma.22web.org/nvc_universal_needs_list.pdf
    • https://cdn-cms.f-static.net/uploads/4365613/normal_5fdafd929aa49.pdf
    • http://poriwesebu.22web.org/satarolapikasisikodalesi.pdf
    • http://findattime.com/jebirexires6hvb8.pdf
    • https://cdn.sqhk.co/jumupebuvi/Oig4hfZ/best_minecraft_houses_that_are_easy_to_build.pdf
    • https://cdn-cms.f-static.net/uploads/4365657/normal_601392ff40524.pdf
    • https://cdn.sqhk.co/waxolulum/ic62Q8a/bedukulufojadegumomorag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wamexatigogov.epizy.com/pre_calculus_12_workbook.pdf
    • http://vuwejamadadodi.epizy.com/71245263534.pdf
    • https://uploads.strikinglycdn.com/files/fa821f42-809e-48b5-bbdf-e7f6118d1a6d/how_do_you_make_creamy_horseradish_sauce.pdf
    • https://uploads.strikinglycdn.com/files/5726b629-4ceb-48f0-a737-524b9389dae4/niganenegotik.pdf
    • http://jegapedobip.epizy.com/recommendation_letter_for_teacher_from_principal.pdf
    • http://zasupafevi.rf.gd/characteristics_of_good_entrepreneurship.pdf
    • https://uploads.strikinglycdn.com/files/8e6f18c0-e4d7-4efa-a41c-e412403924b9/31128782356.pdf
    • https://uploads.strikinglycdn.com/files/c70dc6a6-f4a4-4829-a32a-7bc63caadf98/gotifedolepodebiz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011639.bin
a673fd860b170ae1b9b8073ba70a605fce834ada9352dcf9dce45c53715c08b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11639 5512 bytes
font_01_sfnt_off000128ec.bin
acd030b1f9ddd701bd45b951cc21e795b8d35fa96441cddbcdd250917cf7f3f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128EC 10364 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.