Malicious PDF — malware analysis report

Static analysis result for SHA-256 f527674f0f684db4…

MALICIOUS

PDF

81.5 KB Created: 2021-04-14 01:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd855047c9c3eb515005b380e887dd6d SHA-1: af80873e93a7f9824bf3ce3b74a1b47906a66c94 SHA-256: f527674f0f684db4ee72d48d93dddcb94712d05e74426f2365eda1307c5a1853
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains a large number of external links, including a suspicious URL to 'kuzutuzo.ru', suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=epson+wp-4530+wifi+not+working
    • http://bestsalestoday.xyz/9839540699e4sot.pdf
    • http://draiwenstore.online/3dse_bios_download00lcc.pdf
    • http://vezdesami.ru/1744245205461s93.pdf
    • http://mebets.xyz/the_making_of_a_poem_norton_anthologypfz9z.pdf
    • http://zesamoa.online/11565378304aycc8.pdf
    • http://zahlungsservice-ch.site/kitefabiparyqpg5.pdf
    • http://vertitribe.store/goxesejiselugirekka1xo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d8f0a56d-b4fa-452b-a5a5-021ea291b97a/rosemuvajosemuwipasas.pdf
    • https://uploads.strikinglycdn.com/files/558bbe56-9670-42ba-86cf-b3b21d744bb1/buxadizimisilojezan.pdf
    • https://uploads.strikinglycdn.com/files/408e5651-4452-4a56-bc89-9fff5509ab39/lawagatabotam.pdf
    • https://uploads.strikinglycdn.com/files/3ed4927f-02fa-454f-9151-03f5913cc94a/the_little_book_of_talent_summary.pdf
    • https://uploads.strikinglycdn.com/files/50c102b3-45e7-4f3e-b446-7a6210c1c1a3/nefuxumujitidafu.pdf
    • https://uploads.strikinglycdn.com/files/08e513cc-863d-4d6d-9ac8-dcd2e8a23751/moviemaking_merit_badge_pamphlet_download.pdf
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_9b20dba11da04535855b2c013fa4053c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/38ea0afe-1ce6-4115-a7f7-929439acdc24/subject_and_predicate_worksheet_grade_3.pdf
    • https://uploads.strikinglycdn.com/files/9067312e-b24a-45d1-aec7-a55cbff92f45/resolucion_de_ecuaciones_de_primer_grado_de_la_forma_axbc.pdf
    • https://uploads.strikinglycdn.com/files/85b3a34d-803e-4781-9800-f435387ad58f/casio_g-shock_original_bluetooth_tough_solar.pdf
    • https://uploads.strikinglycdn.com/files/66a2ef7d-1b6a-452a-995a-0822e408c3ca/review_zyxel_c3000z.pdf
    • https://uploads.strikinglycdn.com/files/c21a1302-a6bb-49c6-85a0-e82640551977/pippin_piano_score.pdf
    • https://uploads.strikinglycdn.com/files/ec9b40c7-9002-432e-aa6c-e25e82539c27/zofenatagekuwawepa.pdf
    • https://0633afab-057d-4448-85e1-ac1a97571725.filesusr.com/ugd/66920c_fdcbf162aa6f4ba5871162b7be1a4ac6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe1.bin
b04ef5e7a97f978d12924e17f3e6018a07a4c7269b153bfb393b737b9c737e72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 5492 bytes
font_01_sfnt_off0000fed5.bin
faccfac7c3e2c1988d8a50e2215f07e060b7c8a834ef2529a31a41d0594dcc3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFED5 4252 bytes
font_02_sfnt_off00010ee7.bin
d3650a6a4fd9aaf0377f1c56af85f2f1c896906f5009da67c5fdf9c97dc88971		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE7 12088 bytes

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