Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39053b6a836ac17…

MALICIOUS

PDF

87.1 KB Created: 2021-05-22 21:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a64b86434af00e327a4fffacd7cff735 SHA-1: 5cbe1796468f4743a69bb4d0564d498332bafdff SHA-256: a39053b6a836ac17f7b362403d092be23b8038b340904756a920bd65069fce09
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, with a specific detection name indicating phishing and trojan characteristics. An external URI pointing to 'seumenha.ru' was extracted, which is a strong indicator of a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://seumenha.ru/strik?utm_term=the+screwfly+solution+tv+tropes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390074/normal_5fdb300f80a29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416789/normal_5fca3a772beaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ea59e8a-57a1-49f4-b10e-db20554f3ad6/nidexusonezi.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/fumufutisesisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08325143-f63a-46c2-a621-01ebfc27681c/how_do_i_reboot_my_acer_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/baltimore_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/692f4ce4-ab7e-4d7e-a6b9-8d2e843c99b1/39762885885.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/83604819075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e189a4-23cd-409c-a950-81caab143388/how_long_does_an_ecg_take.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/18309943360.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/best_app_for_beginner_bible_readers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2765c7-9b5e-46ba-a3f5-ce0018aaf971/xfinity_tv_dvr_manager.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/omron_walking_style_iv_step_counter_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6684b012-8237-4677-821a-6160b18ca5ad/bopinezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb11f30f-1adc-4316-baec-088ea39aa311/29856478610.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/60679814363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44de579b-91d9-425c-834b-3a4491ab7088/zoxeguxak.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/41154791120.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/lazajuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990f631d-8c0a-4412-a599-bf3e3705b6f4/how_do_you_get_roblox_on_a_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/2600445581.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/verbos_regulares_e_irregulares_en_ingles_y_espaol_en_pasado_simple.pdfIn 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_off0001143a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143A 5096 bytes
SHA-256: da752ffb5601519f00ef28354c7a0994e9ef038224da5c364c28f2d8edf810e4
font_01_sfnt_off000125b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B0 11836 bytes
SHA-256: eff65faefec1016f29ad11988c7c00bdb8bc0dfd33a1559fa2493b93f7c6e86a

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