Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fd29d9c0e11c9b…

MALICIOUS

PDF

79.6 KB Created: 2021-03-06 07:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9eaeba3d5da36968c4b849ffed5d10ca SHA-1: 112293fadc77467a346cc4670189396728d17c64 SHA-256: 40fd29d9c0e11c9b2a8ec66dc5e42f45eaf0f3690543e078adc63905f4fe5e0d
156 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, many of which are to suspicious domains, indicating a link farm or SEO abuse tactic. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the primary goal is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://xajibur.ru/123?utm_term=blood+bowl+releases+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489993/normal_601a7429cc35d.pdfIn PDF document text
    • https://cdn.sqhk.co/powosinubuk/hb7jjii/bullet_journal_savings_tracker_printable.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404515/normal_5ff4c44e7ef36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481552/normal_5fd7757f679ae.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/jzQvhfE/dogfight_musical_summary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415518/normal_601448672ec8e.pdfIn PDF document text
    • https://cdn.sqhk.co/gimatuvuwiw/HLHgiM8/9345545558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474192/normal_600eafdc3c3d2.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/e74310ee-c3dc-4109-ae93-354708cc9bac/how_to_check_my_p_ebt_balance.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/thermometer_calibration_record_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/update_facebook_lite_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/kusufa.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/rozumisa.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/manamaligixoni.pdfIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_0ed01f77b1794b8aa0293e3de567cf2d.pdf?index=trueIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_d87dd409cd614b44a066cf3268681e11.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/watajive/2011_chevy_silverado_2500hd_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1571cac9-9c6b-48e1-ac9d-c912668242a1/como_hacer_un_archivo_en_el_celular.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/rapagatadivijujenopof.pdfIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_eae11b33f556442c84419f6f90c33f46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dumupa/earth_s_tilt_seasons_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dd03995-4c70-4ffc-9fbd-eb7e29fb292f/gif_de_buenos_dias_mi_princesa.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_a7ab46a322264193861ee89cff098a7d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafirawit/bionicle_mask_of_light_full_movie.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_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 5372 bytes
SHA-256: 0750a5cc14314d3c6bf84a47dedc00fbc42e1b1977db267b9845e26ce44b41e7
font_01_sfnt_off00010be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE6 10804 bytes
SHA-256: a09439053c26960fbf740fe13c8e3cb2a52fe38905fff9a864194577be6f00ec

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