Malicious PDF — malware analysis report

Static analysis result for SHA-256 37afb4d84dc2e275…

MALICIOUS

PDF

83.3 KB Created: 2021-03-12 12:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0386ea9d59679e51d6d627272549e30b SHA-1: 0d4df3e0874598494bc82535808f34abac6061d3 SHA-256: 37afb4d84dc2e27589d99d86a82b49a10a237a61250f8e438a4ce48146bfc852
136 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL identified as a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of 'curl_test.pdf' in the document text suggests an attempt to download and execute further content, likely leveraging the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://maypoin.ru/wix?keyword=celeste+chapter+2+heart PDF link annotation
    • http://zawugudumi.getenjoyment.net/sat_reasoning_test_preparation_books.pdfIn PDF document text
    • http://fofolep.mywebcommunity.org/how_to_unclog_a_hamilton_beach_flexbrew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_603e55bcb9054.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475729/normal_6046366d7c15a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453579/normal_5fc752ad26fda.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/tigoxexuda/fhYjdYp/go_dog_go_ball_launcher_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498868/normal_6014b98c105be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444353/normal_5feb9ca83b08b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427282/normal_600fa59d55e4d.pdfIn PDF document text
    • http://tojuvapemupo.mywebcommunity.org/jebemame.pdfIn PDF document text
    • https://cdn.sqhk.co/menodotitit/TcjbDLT/pikibifebewawinobibinu.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/ihNhbji/drift_tuning_horizon_4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448727/normal_6033447e5d92d.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/cjbjevr/98466441971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487927/normal_5fe9be25d3304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475729/nIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/13465669969.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/bicep_curl_test.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/bonawijorokisowekazabamar.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/epl_goalkeeper_clean_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/berserk_anime_1997_vostfr.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_off00010a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 5056 bytes
SHA-256: 8ffacae9ea69defe292145e76a7c83bfd5c8a04971a946134b253f5e6156194b
font_01_sfnt_off00011b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B93 10544 bytes
SHA-256: 690007706d6f957c5396e3f5973d91ea1814fee1ef4d7d2fb20ef70fb9816567

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