Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ff1dc725678d0a…

MALICIOUS

PDF

87.8 KB Created: 2021-04-02 21:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e83bd5c9ab2c86059ee32d2a2b93693 SHA-1: 9b9097aa34cef05363995f4ed1067cbf8017ed24 SHA-256: 98ff1dc725678d0a5cdfc4314dc051fb9fac2731e6d4d15559463c904fbc3fef
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a prominent one to 'bologen.ru' disguised as a game mod download. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The PDF structure suggests it's part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=game+of+monster+apk+mod
    • https://cdn-cms.f-static.net/uploads/4379241/normal_604d96d579474.pdf
    • https://cdn-cms.f-static.net/uploads/4418379/normal_603fe60a119a8.pdf
    • http://vopagokiniki.mypressonline.com/xifijipazitufubofexonofa.pdf
    • https://static.s123-cdn-static.com/uploads/4486034/normal_5ff9f9608e7f6.pdf
    • http://rumafelaneli.mygamesonline.org/begrung_deutsch.pdf
    • http://namabal.scienceontheweb.net/onenote_ipad_annotate.pdf
    • https://cdn-cms.f-static.net/uploads/4492286/normal_604d5fdba3ba2.pdf
    • http://rodisawikikofu.medianewsonline.com/business_vocabulary_builder_advanced.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lixuduwonifa/16288909349.pdf
    • https://uploads.strikinglycdn.com/files/8355e03f-1c2b-46b7-a3ee-7fef6cc69fdf/how_to_write_an_introduction_about_a_poem.pdf
    • https://s3.amazonaws.com/dozore/pakiwesinisa.pdf
    • https://uploads.strikinglycdn.com/files/9cc8f432-7061-4277-aee4-edc1cc70cf55/essentials_of_psychiatric_mental_health_nursing_8th_edition_ebook.pdf
    • https://uploads.strikinglycdn.com/files/bde25c3b-b5fc-427d-a68e-3e9b35b889d8/kunijijobanunelezeg.pdf
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_0238d74a3b5147dba0c77cf1cab0ff37.pdf?index=true
    • https://s3.amazonaws.com/xezujuxoz/telomurilisixojelubido.pdf
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_7071ffb5afb24923aa6d69bc7456a5d0.pdf?index=true
    • https://s3.amazonaws.com/bubodeliza/lijoxamigorupolusetasotu.pdf
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_af59eb3654d94e718de4ff9795eec738.pdf?index=true
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_8a5eb644896846ad80cfe7468c46084b.pdf?index=true
    • https://s3.amazonaws.com/vabedafozo/37310684322.pdf
    • https://s3.amazonaws.com/xazarujokemus/pozejadijokafu.pdf
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_44635a2d0e634e2f905685b738bbe8bc.pdf?index=true
    • https://s3.amazonaws.com/kitakilesa/update_android_apps_without_play_store.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_off00011a89.bin
26c15d20fbb941ead79ce0e5a02beebc97bc2fa37b88cf6f2bbb87336f7884c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 5252 bytes
font_01_sfnt_off00012c5b.bin
1dd221cfa38af787741400e9ed593ca80758a2e4cba98739f29f5ed112c27073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5B 10860 bytes

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