Malicious PDF — malware analysis report

Static analysis result for SHA-256 85bb9f85bfa483fb…

MALICIOUS

PDF

78.1 KB Created: 2021-05-03 18:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b93faa7467d922e9581b11686252647d SHA-1: 20477533dd48158b3ddfee0ceeffa670866222a6 SHA-256: 85bb9f85bfa483fb1acd4d7c4825057b5fc3a7dfbc5c735699b47cb8b841752c
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The embedded URLs, such as 'https://dafemum.ru/strik?utm_term=skyrim+how+to+use+mods+xbox+one', are designed to lead users to potentially harmful content. The ML classifier also strongly indicated maliciousness, supporting the classification as a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=skyrim+how+to+use+mods+xbox+one In PDF document text
    • https://cdn.sqhk.co/xororasomig/hbhbiaT/army_battle_buddy_carries.pdfIn PDF document text
    • https://cdn.sqhk.co/xezufulozuwo/icLliei/minecraft_skins_editor_apk.pdfIn PDF document text
    • http://leoidet.xyz/oxford_dictionary_translate_english_to_spanishxtdbu.pdfIn PDF document text
    • http://homearfes.com/varunuwibiremesejemupixs57a.pdfIn PDF document text
    • https://cdn.sqhk.co/bosesegivu/IhdPE5i/mipinuvugiloliporivok.pdfIn PDF document text
    • http://new-volosi.ru/girixajixidokoxokodomerixeo41.pdfIn PDF document text
    • http://discout.online/6032137230ghgsu.pdfIn PDF document text
    • http://lixusopo.mywebcommunity.org/nowuxuxuwupoz.pdfIn PDF document text
    • http://adv-workshop.site/free_printable_accounting_ledger_templaterpccc.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/egfhjji/microsoft_azure_certification_roadmap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_89e417fa215c4e27bf90c9888ff57da2.pdf?index=trueIn PDF document text
    • http://nibopinalilabaj.onlinewebshop.net/bedubeliro.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_383392d664f64902b9eb2917fa884d02.pdf?index=trueIn PDF document text
    • https://e518440a-9440-458f-9a08-48a017ad8d08.filesusr.com/ugd/bca722_9ebdc4d7d30342b7810799acf150a70e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawovojo/kobubofavija.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/brinks_security_light_7252.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/48007427932.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/nowelelorumosadabobafax.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/tezamiduxe.pdfIn PDF document text
    • https://73e8eba8-f08a-4c12-987a-519a82e171c2.filesusr.com/ugd/19159f_f0be534378c24ad0a798d134cc713a99.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 5392 bytes
SHA-256: 950c987d23ff586aa7ca0bca936a9166a15407002fd22e829184f94676ddf75e
font_01_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 20784 bytes
SHA-256: d8320e144a657f60f8822d773d70bf9d46a97bad8b946fa408a4f50b335cc859

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