Malicious PDF — malware analysis report

Static analysis result for SHA-256 50102e1ef21809a7…

MALICIOUS

PDF

83.3 KB Created: 2021-04-05 06:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: feb05fc903e8176efdd8a8693bbcd7ac SHA-1: dfb10dd93eebe93f226c274c441c17c9dad21606 SHA-256: 50102e1ef21809a7bef1430a1e3c5187f82f5dd95c95552e130c92d9fd0811c4
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/123?utm_term=aggiornare+android+auto PDF link annotation
    • https://sutafufig.weebly.com/uploads/1/3/4/4/134402916/kotugefabukal-mixipezewavatu.pdfIn PDF document text
    • https://nivosuvadifo.weebly.com/uploads/1/3/5/3/135384950/nefixipisofi.pdfIn PDF document text
    • https://gemuxobupi.weebly.com/uploads/1/3/2/6/132682013/9058281.pdfIn PDF document text
    • https://fegunase.weebly.com/uploads/1/3/4/6/134603704/kadinexe.pdfIn PDF document text
    • https://figuzejigof.weebly.com/uploads/1/3/4/6/134644002/xidab.pdfIn PDF document text
    • https://goweruvewej.weebly.com/uploads/1/3/6/0/136015665/dbc01c1b1c.pdfIn PDF document text
    • https://dozumudokasalog.weebly.com/uploads/1/3/4/9/134902229/9bec65.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/pavujiniz/wasajamabikuz.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/video_recording_editing_software_free.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_9e47f68e9ec44c9aa166cdfc97f5285c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/general_ielts_reading_sample_papers_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/microsoft_mobile_application_architecture_guide.pdfIn PDF document text
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_a4f2dfc3e8a5417387e9ef0313ae1c4b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/days_of_the_week_worksheets_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/jio_games_play_store.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/zavekinananibuboganatiru.pdfIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_5940f58ad2724274aee5239e0ad09354.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakadutof/is_the_model_3_faster_than_the_model_s.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/xekapexemodiju.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/emulator_android_mobile_legends.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/itunes_app_store_for_windows_10.pdfIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_90a0d602d86345e8a816793453661c27.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lawakux/el_guardian_del_centeno_pelicula.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 4772 bytes
SHA-256: 38f575611e7a28fbc506b198b362fbef2696a27e9541c4200dd5b184c43ba349
font_01_sfnt_off000104d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D1 11528 bytes
SHA-256: e6453cb27c94457b75d5e22ef6562fd00c6f33bf0dbbeadccb5c5ec3b2c773ad
font_02_sfnt_off00012a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A69 16128 bytes
SHA-256: cd1484052dade53e9b9513cb8141db40e34719b7e4f1adbf7db00d78d9f52eb7