Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca4b54d44aff86c…

MALICIOUS

PDF

78.4 KB Created: 2021-05-22 03:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 80082528ef864f8457ddd407d3a3d03f SHA-1: 2307c1e91400135277a0ccb51b27843e289a26e5 SHA-256: aca4b54d44aff86cea962aa632d6af4dbbb5d0930eb4a8e414e724ea44ebe4fc
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an external URI pointing to a suspicious domain, and ClamAV detection confirms it as malicious. The document body, though heavily obfuscated, appears to be a lure related to 'internal combustion engine fundamentals' to entice users to click the embedded URL. No scripts were extracted, but the presence of an external URI and the ML classifier's high confidence suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=internal+combustion+engine+fundamentals PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372377/normal_602bae3ebf08a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404293/normal_601d87b90a011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485451/normal_606b93190df9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417806/normal_5fcee31fcbcd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/xufiwixiwisixotex.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/jifadinifodejag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab427bc4-aa17-4695-846e-5b49c8fdd05a/51408475951.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/29015888050.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/sopaziponaraguguma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae1d9bb-1f93-4195-83d6-4fa682ee63cf/hp_probook_6470b_core_i5_price_in_kenya.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/final_fantasy_xv_comrades_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/parallel_perpendicular_and_skew_lines_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/28606573413.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/chinese_chess_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10ad211a-51c4-4cb5-9249-95bda85d14be/primal_strength_half_rack_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8bc0a56-aa0a-46a4-98ec-b5ad3da0aad6/81112590189.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/escala_alvarado_apendicitis.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/john_deere_9500_combine_oil_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba2cfda-9a48-41ab-9fe8-5438ba1224f3/frigidaire_dehumidifier_30_pint.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/gold_brick_guide_lego_marvel_superheroes.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_off0000f4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 5420 bytes
SHA-256: d25c782f6c7886b80d7750223700a9e39d3c3b8c9aa5bb7be33e8e23ec34ff9a
font_01_sfnt_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 10952 bytes
SHA-256: 7d1d09cbb540e18d6db6df2115304f1a9003412a78dfa7197a41d726905cfe20

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