Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fca670137b576be…

MALICIOUS

PDF

80.9 KB Created: 2021-04-06 07:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddd307fb9977fb25f0c74cc190486818 SHA-1: 215ee9a7a9c9b688f65a9b99f5be8867a84475bb SHA-256: 2fca670137b576be076979f9385b4bf554b88139add1a96e5f64bf56e192f4d3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the nature of the links suggests the document is designed to redirect users to malicious content, likely for further exploitation or credential harvesting.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=how+to+improve+reading+writing+skills
    • http://voirly.xyz/nisaloteri5l6tk.pdf
    • https://befetoxakotupo.weebly.com/uploads/1/3/0/7/130738956/patejitatepu.pdf
    • http://eushopvmn.site/58575218457quv3i.pdf
    • http://dazavaluk.mygamesonline.org/xusikomudotufazewavigoza.pdf
    • http://fanilobepewe.sportsontheweb.net/pafadakapaso.pdf
    • https://ravojinukof.weebly.com/uploads/1/3/4/4/134476618/walawipibijogok.pdf
    • https://vorevowupi.weebly.com/uploads/1/3/4/6/134633589/tomujo-kixurikav.pdf
    • https://leresawukulet.weebly.com/uploads/1/3/1/3/131384076/sifutepufo_vosanitujeb_joveru_numage.pdf
    • https://zuzilenew.weebly.com/uploads/1/3/4/5/134527977/kasixebibof.pdf
    • http://namelesssouth.xyz/najavexinarigoxisijufikuw579bo.pdf
    • https://zuginapox.weebly.com/uploads/1/3/2/6/132695273/nodedumikaduvuxepe.pdf
    • https://wisemidotoveto.weebly.com/uploads/1/3/4/3/134349295/tofaxopanesetos-tinitilidax-penijidaremev.pdf
    • http://douchehq.xyz/is_developmental_disability_a_mental_disorderdaw9e.pdf
    • http://zitugaxusi.mygamesonline.org/logitech_z_5500_price_philippines.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_8912480a6da34fd48dad912caf05f4bc.pdf?index=true
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_e4f2bebc166344f1bb15beb771450c27.pdf?index=true
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_1d2a989a6d6b4b2c80476d0e29609769.pdf?index=true
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_4b21bfcd08d3440a9c8981086b164283.pdf?index=true
    • https://s3.amazonaws.com/gezejoputiwinu/alien_shooter_4_pc_game.pdf
    • https://s3.amazonaws.com/risisipajole/cooks_essentials_6_qt_pressure_cooker_manual.pdf
    • http://wukevivetarapu.myartsonline.com/ccaps_34.pdf
    • http://pugazapuxijal.myartsonline.com/file_convert_to_excel.pdf
    • https://s3.amazonaws.com/fibesezati/kixijevamupexurekinunofos.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_off0000fff5.bin
cf36790d91d8a4858a5c5246419fe97d735f8eec5834401842dc1eeef5fe1202		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF5 5456 bytes
font_01_sfnt_off00011283.bin
9b182de06bb87511fe87e1a36a31146b69f50fb9415cc1ec5a21ecff55ec734e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 10576 bytes

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