Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc3f634446780c3…

MALICIOUS

PDF

77.8 KB Created: 2021-03-18 11:52:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99897e5929e3437973830f6ef0b3ecb2 SHA-1: 27f1958b0bb508f6557b716d2533cdab980a9e3d SHA-256: ecc3f634446780c3d619124565c0e6ace1a190f26c342cfeb311f97bbdeaaf08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, flagged as a 'PDF_SEO_LINK_FARM', with one prominent malicious URL identified. ClamAV detection and ML classification strongly indicate malicious intent, specifically related to phishing. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/123?utm_term=geeks+who+drink+answer+of+the+day
    • https://cdn-cms.f-static.net/uploads/4383471/normal_602c798424972.pdf
    • https://zagiwesojuju.weebly.com/uploads/1/3/2/7/132712322/jijozuzozasen_xujorijifula_kobujugowumubi.pdf
    • https://static.s123-cdn-static.com/uploads/4480880/normal_5ff2871a70bc6.pdf
    • http://afterdealer.pro/lucky_block_mod_for_minecraft_bedrock_editionee9cc.pdf
    • https://sazadasixitabe.weebly.com/uploads/1/3/4/4/134404720/todivu-lanizum-wenifuwipalo.pdf
    • http://blacktea.space/arcade_games_unblocked_onlineahgg9.pdf
    • http://good-production11.site/neruvax2056v.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9bb86c64-a259-4544-bc21-276279f2a193/xejugapozuv.pdf
    • https://uploads.strikinglycdn.com/files/efbf0fc9-4d0f-40f9-a0e5-5eadd8c19bd4/pabuwinoganidisedexarere.pdf
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_4d40f5249a364ac5b24eaaa239eacc67.pdf?index=true
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_4ba91d3a9ddf482a9a266d457a922a49.pdf?index=true
    • https://d2497fa9-5496-4194-9764-f4b168485e88.filesusr.com/ugd/eed259_8c3cf7eef3b54f79957ea0db806bbb8b.pdf?index=true
    • https://e33362eb-94ba-4427-a888-6f4863169a18.filesusr.com/ugd/36ce96_b4993bc404374e62a9e7e3a1ba7c1bf9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/756bf0e8-3784-4048-b419-5f54e005c0c7/que_es_un_taller_de_capacitacion.pdf
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_44be885cfedd4b3fac7d0258d7c24610.pdf?index=true
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_a3784a213e9840dda1c454d9db865872.pdf?index=true
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_14114f00826f4c24b8831324c324efab.pdf?index=true
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_90564ca529174f5c8bf93a1dd110b625.pdf?index=true
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_5dff2988aee645d4a32ce3c10e34720c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4dbae087-0b69-4e73-b208-6abf9df1f686/great_writing_5_from_great_essays_to_research_3rd_edition.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_off0000f03b.bin
0e7487c08e0531553c4f361caa9ab0b9dccea038d61981b3fa5833bbaf2d046f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 5252 bytes
font_01_sfnt_off00010232.bin
1e4a09efb860097c9b5af518404303a722bcebb0591741f1f76900620d0897c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 11200 bytes

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