Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6b6c29db5afe30…

MALICIOUS

PDF

79.0 KB Created: 2021-03-08 14:37:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 69f74e3eda074c0c653a43900ab4a40d SHA-1: a2210af1c7d20bc79956eb7da60a5dcfb7b0b268 SHA-256: df6b6c29db5afe30bca6b16ba2c88e4d97923fc582bed6ddd4685f4088b7ad8d
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing a significant number of external URLs pointing to various disposable hosting services and domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/wix?keyword=sol-gel+process+steps PDF link annotation
    • https://janazasifopuno.weebly.com/uploads/1/3/4/4/134437996/degekivalese.pdfIn PDF document text
    • https://todukikezigegu.weebly.com/uploads/1/3/4/3/134359798/8082876.pdfIn PDF document text
    • https://kewisivi.weebly.com/uploads/1/3/2/6/132681156/xubotuv_bulitonoje.pdfIn PDF document text
    • https://zogumunatol.weebly.com/uploads/1/3/1/6/131636745/55888eabc.pdfIn PDF document text
    • https://pegutezupo.weebly.com/uploads/1/3/2/7/132740329/wuwiwafero_tekejatupami.pdfIn PDF document text
    • http://wodunobogigav.22web.org/ruzesomazevovek.pdfIn PDF document text
    • https://begafirezudafo.weebly.com/uploads/1/3/1/4/131438667/999b6bad9d19e.pdfIn PDF document text
    • https://papuwupiruji.weebly.com/uploads/1/3/4/3/134348025/datanaxemudav-tapokupavowo.pdfIn PDF document text
    • http://winefesa.22web.org/9046696773.pdfIn PDF document text
    • http://xidazizupezi.22web.org/best_app_for_stock_market_news_in_india.pdfIn PDF document text
    • https://pafutidosuzov.weebly.com/uploads/1/3/5/9/135989867/8935049.pdfIn PDF document text
    • http://juzawuz.iblogger.org/battle_royale_game_online_no.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wireruzivu.epizy.com/kikuwizi.pdfIn PDF document text
    • http://posufimiru.rf.gd/miller_welding_hood_parts.pdfIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_22d7c1aa35e34f12a1ea9e3a4c54e068.pdf?index=trueIn PDF document text
    • http://jokajovasoxaruf.epizy.com/storyboard_definition_simple.pdfIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_322ef5968ef549148e2f2f065bcfbaa2.pdf?index=trueIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_02c72f89a54f4e95b85d9e85459e1df0.pdf?index=trueIn PDF document text
    • http://wuxiwojimi.rf.gd/how_to_do_enthalpy_change_problems.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_41710468b3e04365ad7d456d9e942cae.pdf?index=trueIn PDF document text
    • https://a1d3e036-d9a1-4be1-9d2f-eedbb581cb22.filesusr.com/ugd/3ce946_18d6b0c6d72b43a487d9282fcb8f7eab.pdf?index=trueIn PDF document text
    • http://gatituz.rf.gd/39171149367.pdfIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_1de9f65ba45d447f906188905ac55952.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_f7f3831429af432e8aafbda43a031640.pdf?index=trueIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_0db899c6d5bf49f0b9496965939ed664.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_off0000f95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 5024 bytes
SHA-256: 14bbeb63041fb423a8e9504e04647873c4e024f291b38ad90bb7f94758d2d615
font_01_sfnt_off00010a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A90 10580 bytes
SHA-256: c9e25fbb665456a4b50cf23689495a0d2947f67d252a0d6e453ea371b83789f0

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