Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d77ad885611d57…

MALICIOUS

PDF

75.2 KB Created: 2021-04-06 16:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9ca8079af4af60e5dee2914e97e47a68 SHA-1: 1d47c72fbe697d8ec2de8869de0d4d88f7429da3 SHA-256: 25d77ad885611d57b2fad692bbe6e2cf94fcd9cec76fe5d26a1e53fecf6de151
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=what+is+sentry+gun+safe PDF link annotation
    • http://wrinklestiltskin.com/honeywell_chronotherm_thermostat_battery_replacementxaiec.pdfIn PDF document text
    • http://tukomibewi.getenjoyment.net/advanced_level_english_book.pdfIn PDF document text
    • http://xanusojuruxu.sportsontheweb.net/64389408195.pdfIn PDF document text
    • http://rusadezebep.mygamesonline.org/14687532044.pdfIn PDF document text
    • http://ruvujagefeko.mygamesonline.org/71577072033.pdfIn PDF document text
    • http://streichpack.online/whirlpool_refrigerator_new_model_20197dwi9.pdfIn PDF document text
    • http://fridgeservice.ru/ruins_of_myth_drannor8huhp.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/what_is_the_plot_summary_of_alice_in_wonderland.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/16045691749.pdfIn PDF document text
    • http://buxeletifexid.medianewsonline.com/biblia_dios_habla_hoy_free_download.pdfIn PDF document text
    • http://bukawavado.medianewsonline.com/picture_description_in_english.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/hp_photosmart_d110a_all-in-one_inkjet_printer_ink.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/jijiggf/nbc_sports_live_stream_sign_in.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/D8ifij3/27208998277.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_d904430a7b9043929ea974651c4e39de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/dawoxukotuvanotad.pdfIn PDF document text
    • http://zedebegeku.myartsonline.com/algorithm_pseudocode_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/44784495801.pdfIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_4495c26e37514aa2af0d1a0840fff55b.pdf?index=trueIn 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_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 5112 bytes
SHA-256: 967c069a7df237585cf08419f0fe26f343d9bbdf375371f5deb7e96a8e960c7f
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 10940 bytes
SHA-256: a8caff13fbcb43eed4c53e7a0b3b482d0cf5756b26732964fd4170ec1d05a346

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