Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c137a88938486e…

MALICIOUS

PDF

82.9 KB Created: 2021-03-14 13:28:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4ae8cc7e8a48af4ee7c8081b08d41835 SHA-1: eff294dab1b3a0b08c4b4993cdf6d36f3cdc1942 SHA-256: 84c137a88938486edbd319250963d276ae4d1c990ff904066a38f65852a112c0
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent URL pointing to 'seumenha.ru', suggesting a phishing or malware distribution lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support the conclusion that this document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/strik?utm_term=learn+c%2523+in+one+day+and+learn+it+well+c%2523+for+beginners+pdf PDF link annotation
    • http://hookup673.site/starbucks_beverages_sizesob7wr.pdfIn PDF document text
    • http://begemot.space/garden_answer_bobo_hydrangeabc51u.pdfIn PDF document text
    • http://usblighter24.site/23671935196mlqfu.pdfIn PDF document text
    • http://losinglotterynumbers.com/extinction_coefficient_calculation_examplempisq.pdfIn PDF document text
    • http://instup.xyz/170869321718sk78.pdfIn PDF document text
    • http://sluzhba1.net/modoxometavomonibu3nh9e.pdfIn PDF document text
    • https://cdn.sqhk.co/dovoxukeni/Ejaighg/2020_can_am_defender_max_hd10_top_speed.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/TSxighf/ghost_screaming_sound_free_download.pdfIn PDF document text
    • http://want-seo.ru/98449549797xvt37.pdfIn PDF document text
    • http://ekzo-fruit.ru/libro_de_los_muertos_egipcio_completo4qmqi.pdfIn PDF document text
    • https://cdn.sqhk.co/fufowomusixi/0ghUUii/coloring_pages_learning_english.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/gjaMjbA/12533801590.pdfIn PDF document text
    • http://harmony-market.ru/what_to_bring_to_dmv_knowledge_testgx5vr.pdfIn PDF document text
    • http://trysalon.xyz/dogogejedunitinukebuzazmlv7h.pdfIn PDF document text
    • https://cdn.sqhk.co/demanajinu/hjgphdK/earth_now_live.pdfIn PDF document text
    • http://momentikshop.space/nuwamixilirosoxalokgkct0.pdfIn PDF document text
    • http://talkme-news.info/hello_all_you_cool_cats_and_kittens_memefrehw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_a0a80bb484b54d678aaa3a4efeed8420.pdf?index=trueIn PDF document text
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_5697c23646de4f37904e7ff65904de1e.pdf?index=trueIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_ba591c18beb24d338a98254807148af4.pdf?index=trueIn PDF document text
    • https://a0758896-f8c2-4fc9-8c7e-5c1738e8bc18.filesusr.com/ugd/0ce882_a81d571dd5714319aa05ad4b7a4cfb3e.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_dbca620704364311998cf3c8235d5a9b.pdf?index=trueIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_28e9a911bcc147ea8b72eef1fedd8f4e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 4076 bytes
SHA-256: 1f4022ad6b2e98d864f484779982cd0b0615940fb689202c7d34066bbaf98e06
font_01_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 11616 bytes
SHA-256: 2cf72474f49915750218c750d86a50e16363cd38fec17d722ba7c1a9af54cac7
font_02_sfnt_off00012f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F37 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f