Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a8effbdcfb7dd9…

MALICIOUS

PDF

76.0 KB Created: 2021-03-28 17:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3797536739d7f0cacaff309a390e422e SHA-1: b0470b5dd4b4670b7ad5abfb231db19b4552c72e SHA-256: 39a8effbdcfb7dd93399ffb26f587ebd00e5e1e3e4c4bf7f12f441d88223b3fb
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/award?keyword=tools+used+in+monitoring+and+evaluation+pdf PDF link annotation
    • http://stankovit.ru/noxokusov05olz.pdfIn PDF document text
    • http://wuziwajevif.iblogger.org/vowel_and_consonant_sounds_with_examples.pdfIn PDF document text
    • http://skidki-day.shop/best_jump_scare_movies_on_hulujrb2p.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/angles_in_a_triangle_worksheet_work_shown.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/ishihara_colour_chart.pdfIn PDF document text
    • http://tezijexipilimo.getenjoyment.net/8547808225.pdfIn PDF document text
    • http://dapunajav.22web.org/65411990256.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/libosokune/wen_56203i_super_quiet_2000-watt_portable_inverter_generator_with_fuel_shut_off_carb_compliant.pdfIn PDF document text
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_db16c2cf2eff4fc09a0e5fa87d6b3332.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/diccionario_tcnico_aeronutico_ingls_espaol_descargar_gratis.pdfIn PDF document text
    • http://nunitew.rf.gd/baby_hazel_games_no.pdfIn PDF document text
    • http://zaluboxif.epizy.com/pdf_to_word_online_editor.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/simple_expense_template_excel.pdfIn PDF document text
    • http://tazolupiviroliz.epizy.com/jovexezewolufop.pdfIn PDF document text
    • http://suwedafi.epizy.com/67305585481.pdfIn PDF document text
    • http://bewimovope.epizy.com/common_adjectives_list.pdfIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_21dbecbcb1a84adeb1771459aad810c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/52052266552.pdfIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_6b30c5d4c1ee47c78c5d332397cb86f5.pdf?index=trueIn PDF document text
    • http://lozedigoj.epizy.com/tulaziwir.pdfIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_064baa3ddbc14c1db1caa93742b4df15.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_off0000e90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 5372 bytes
SHA-256: eab39f5807006fcdb63f0b27486765bc28094fa4f67f721ef36ed896e6c4c810
font_01_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 11804 bytes
SHA-256: dfd9a91538e312af7a1c0a8c51a8449cabfe6e94e2fc8e794c2707560c1aa365

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