Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3d919d9e7cd56b…

MALICIOUS

PDF

76.2 KB Created: 2021-03-19 17:28:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 895b62b7fcae6b54831606721184de6e SHA-1: 28c1050cef128c24898020bc415fbd118607ca14 SHA-256: 8c3d919d9e7cd56b9ebfdecb1afdd732ef266a8f2e6593cbace6b0bd90a1cdc7
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Short term causes of world war 2', likely a lure. The presence of numerous links on disposable hosting and the ML classifier's high confidence score suggest a phishing or malware distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=short+term+causes+of+world+war+2 In PDF document text
    • http://zerkalo-fugicar.website/4352251621ptzwi.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/5BbjfCs/count_dooku_lightsaber_toy_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/ggc2jgf/family_farm_seaside_aquarium.pdfIn PDF document text
    • http://galufixagomedo.getenjoyment.net/likifezipidapesid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403274/normal_600e0244c144e.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/RgjggqD/mixofexofipezavuxokutaxe.pdfIn PDF document text
    • http://novonet.online/tunufewenifanerojexeluzodko.pdfIn PDF document text
    • http://geniusenglish.space/lego_star_wars_tfa_mod_apk_rexdlos08r.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/76592609675.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/sherlock_holmes_books.pdfIn PDF document text
    • http://kidobujugi.mypressonline.com/galetub.pdfIn PDF document text
    • http://zuvatewovu.scienceontheweb.net/conversation_casanova_book.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/8Sjeigs/story_adventure_games_for_android.pdfIn PDF document text
    • http://cpskras.website/fullsteam_brewery_instagrama59ut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_60412dcfe42b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rususekobijo.myartsonline.com/how_to_clean_jenn_air_range_hood_filter.pdfIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/netbeans_java_gui.pdfIn PDF document text
    • http://mosenoganeb.epizy.com/what_is_a_corporate_identity_plan.pdfIn PDF document text
    • http://suxopubovokok.epizy.com/starcraft_2_heart_of_the_swarm_cheats_kerrigan_level.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_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 5588 bytes
SHA-256: 6dfc4d5567f78ade90e0e617bfeffb67166ab456a6fedcc0b617c83d233d1b76
font_01_sfnt_off0000fdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC5 11188 bytes
SHA-256: 9ba6d2e5637f742671c13fa59fd13ac133b42bdd5e29cc522ee7075e48bd58f7

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