Malicious PDF — malware analysis report

Static analysis result for SHA-256 99317a02e5c0f6a4…

MALICIOUS

PDF

77.8 KB Created: 2021-03-05 19:51:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2f02d24e37c194a0435fed559b53b41 SHA-1: 62336a2c62580c9f4da0ad4e3c65a2efa09b6046 SHA-256: 99317a02e5c0f6a42269b0bf7e65d7b9668fb5e9221ec6174ff5586a51a751a8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, with one prominent URL leading to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, appears to be a lure related to game search terms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=tuper+tario+tros+mario+games
    • https://cdn.sqhk.co/mugodetutag/hj1YWBB/business_management_simulation_games_online_free.pdf
    • https://cdn.sqhk.co/xajevedu/hid4Ihb/43386743650.pdf
    • http://rezonansmusic.com/76451020243pgwnb.pdf
    • https://cdn.sqhk.co/saligoliti/8CNzjP9/excursiones_para_cruceros_por_libre_islas_griegas.pdf
    • http://edevletorg.com/baby_picture_generator_free_nomqxno.pdf
    • https://cdn.sqhk.co/xamowizaso/ebjf8ig/40456046.pdf
    • http://axacheat4.xyz/bn_iu_cy__nha_trangj5qam.pdf
    • https://cdn.sqhk.co/raxoxawupej/zjgBheI/address_for_sports_connection_northlake.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_1c55dfc391d84783a8807eba50f7b576.pdf?index=true
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_12c4a97971304f80aac6bd02c357dfd1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/636fca26-0603-40df-8ef1-ab51cd06bd20/lista_de_verbos_con_infinitivo_y_gerundio_en_ingles.pdf
    • https://s3.amazonaws.com/lowuwofuxali/87510139439.pdf
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_6eeac65f65cb4eb68960cb4cf6a1c25b.pdf?index=true
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_46d21e97dccc444bb736737a10e7fc65.pdf?index=true
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_cd20673c11124df6b1b6076e2815c141.pdf?index=true
    • https://uploads.strikinglycdn.com/files/39550d01-201c-47ef-9ec8-07caec603e0e/how_fast_does_a_125cc_pit_bike_go.pdf
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_1bbfe4df88ce46b1919ca7b0cadca474.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f88755ef-ad3b-47da-87b3-371b14298be1/joxenasivob.pdf
    • https://s3.amazonaws.com/vojapu/belling_electric_range_cooker_manual.pdf
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_40a0e8a72cba452aaaabd53047e30688.pdf?index=true
    • https://uploads.strikinglycdn.com/files/84684a5a-39d0-48ef-92e1-ad5d42af70d3/petubojunuwapasanijalake.pdf
    • https://s3.amazonaws.com/dosalapasenow/71904425310.pdf
    • https://s3.amazonaws.com/polojuliragam/mazenusedadenana.pdf
    • https://uploads.strikinglycdn.com/files/c10b3858-0c10-43ef-bc5b-11a326aff52a/39727333036.pdf
    • 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_off0000e7fc.bin
8ad23e78151bf40319b4dc21002381cf81d611e75bcdd6add2d880840628e16f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 4832 bytes
font_01_sfnt_off0000f871.bin
01dd5440cb9475c0ff5fdc67bff8c49c63698e03cb2efab6d1b80ab748289250		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF871 10228 bytes
font_02_sfnt_off00011b8b.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8B 4324 bytes

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