Malicious PDF — malware analysis report

Static analysis result for SHA-256 49cf03ed9254adda…

MALICIOUS

PDF

81.5 KB Created: 2021-04-04 05:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ce8057f509458449c2e80422ffcb815a SHA-1: 56eebb9d30155a125f6612518c1481d9a17a0fb7 SHA-256: 49cf03ed9254adda9284e7811d46016f49aa960881ddd69724ee4585d63932c4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://pelibifir.ru/strik?utm_term=is+the+copper+chef+electric+skillet+dishwasher+safe PDF link annotation
    • http://topcreditcheck.info/irobot_braava_m6_robot_mop_reviewsjf5sv.pdfIn PDF document text
    • https://cdn.sqhk.co/tosijoxopum/rjjAFpZ/pacsun_return_policy_online.pdfIn PDF document text
    • https://cdn.sqhk.co/dukizukijire/cicjdhj/gebesuwofujiguxego.pdfIn PDF document text
    • http://slimitalia.space/3464741510026yc5.pdfIn PDF document text
    • http://sufewonu.iblogger.org/xarigasef.pdfIn PDF document text
    • http://formverifiedbadge.com/american_big_picture_a1hhv06.pdfIn PDF document text
    • http://xenogogumemikek.66ghz.com/graphs_of_sine_and_cosine_functions_ppt.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/haggheH/rajilevoli.pdfIn PDF document text
    • https://cdn.sqhk.co/xekobigi/Shbgdhh/corneregel_ulotka.pdfIn PDF document text
    • http://raftgjgr.space/national_geographic_kids_magazinepcv9b.pdfIn PDF document text
    • https://cdn.sqhk.co/pipagalax/jajcijF/adidas_outlet_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_6b661c0edff845bea3fdb1358e3493a2.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_cb9fb6cf42714707a17341cd7d9cc4c2.pdf?index=trueIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_2593f52d9ce344e1911a8a116190c5df.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_82c7f1de296c47af929cbbc5917fbbd8.pdf?index=trueIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_7de1dba37d57489789cf60211ba1e8b3.pdf?index=trueIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_46b3c91424b949d8a4b32f92b16ab0d4.pdf?index=trueIn PDF document text
    • https://288dffde-0386-48bd-adba-b069b5f3b70f.filesusr.com/ugd/7e1b39_014f9de68ed3408fa94c54bad0b4dfb5.pdf?index=trueIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_523c3c75162b4c78827d8ba199d0b6fa.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_178c59d671d7450c9e61c9e2f3e4a854.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_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 5336 bytes
SHA-256: 81b22585cdd0bc770b49be2a2aa8da7046839a5f1364939b1200e26e545f9d8d
font_01_sfnt_off00011218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11218 11212 bytes
SHA-256: 6b0226b7d58a363ffeae4fa6144753f2a794c379a59611daee4837b994bad5c7