Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24a43fb89425673…

MALICIOUS

PDF

135.0 KB Created: 2021-03-12 11:16:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8d1c71ce7d61b78f2a998604d9d930bd SHA-1: e91be3dcc4086eab7649896d79b3a06d7e3d56dd SHA-256: d24a43fb89425673086ea990829d92a066df48c56c7fdeb181eb430d39626409
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, with at least one pointing to a domain associated with phishing or malware distribution. The PDF structure and embedded content suggest it's designed to trick users into clicking malicious links, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://mezovuduw.ru/award?keyword=buried+child+full+play+pdf PDF link annotation
    • https://cdn.sqhk.co/torujazelome/jfihl2o/boromiguj.pdfIn PDF document text
    • http://allerop.xyz/baraxidunekoxualehc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503390/normal_60076e33c85aa.pdfIn PDF document text
    • http://souve.me/protocols_used_in_tcp_ip_models3kkl.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/eheKjjk/high_end_gifts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411702/normal_60004c9ca079e.pdfIn PDF document text
    • http://olipaka.xyz/1171577673203sgl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490272/normal_5fd60e8273b17.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/gTJLSJX/atomic_super_lander.pdfIn PDF document text
    • http://sokfresh.fun/5950079086kog0i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wufuxoponuwuros.epizy.com/gb_whatsapp_8._65_version.pdfIn PDF document text
    • http://gagoxuxu.rf.gd/60966420668.pdfIn PDF document text
    • http://lefadubofow.rf.gd/ambari_film_kannada_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/21026879165.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/gudukisijarotaxiw.pdfIn PDF document text
    • http://fumesowira.epizy.com/fizz_runes_guide_s9.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/20036878803.pdfIn PDF document text
    • http://litopuputorer.rf.gd/97975019197.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/21518304548.pdfIn PDF document text
    • http://bugavujozi.epizy.com/human_body_systems_crossword_puzzle_worksheet_answers.pdfIn PDF document text
    • http://kozolamo.rf.gd/liver_cirrhosis_guidelines_for_management.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/printable_phonetic_alphabet_chart.pdfIn PDF document text
    • http://luzutajezilako.rf.gd/kifojujiwewufil.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_off0001ce96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE96 5216 bytes
SHA-256: 9da70aff0234d944c39b3c2d5e3bf23007ed07d67d500993b73164de0e65ff72
font_01_sfnt_off0001e05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E05D 14516 bytes
SHA-256: b81e7f9a1213a1421fc6bba7b1a8bf59eb13f8b3829f9ba6d423eefd07744783

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