Malicious PDF — malware analysis report

Static analysis result for SHA-256 8666c4c9451f79cd…

MALICIOUS

PDF

80.9 KB Created: 2021-03-22 06:01:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15e001f794922f42e90f0d051b07794f SHA-1: 7bc44aca0ec89ba5da83d60d4654aa4c5ecb0e69 SHA-256: 8666c4c9451f79cd79c34c0a54c0c98106b86d182aa831823611cd58f4337d58
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a disposable hosting domain, suggesting a link farm or redirection scheme. The PDF's structure and embedded content indicate an attempt to direct users to external, potentially malicious, websites.

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 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://xezojetit.ru/wix?keyword=schwinn+moab+1
    • https://cdn-cms.f-static.net/uploads/4496170/normal_602801b0f30ad.pdf
    • https://mekupefaju.weebly.com/uploads/1/3/5/3/135316310/f6c9ecfd181.pdf
    • http://denizan.com/easiest_song_to_play_on_acoustic_guitar_evermjuwo.pdf
    • https://cdn-cms.f-static.net/uploads/4501775/normal_601ad7cb33311.pdf
    • http://mirijesuwakug.sportsontheweb.net/finding_surface_area_of_3d_shapes_worksheet.pdf
    • http://kzrovk.xyz/65647345647tkci5.pdf
    • http://1xbet-registr.site/94988903658z08jg.pdf
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/7198b40835d3893.pdf
    • http://trysol.xyz/238488647929yiz5.pdf
    • http://aycotoro6.xyz/can_you_charge_nimh_battery_with_nicd_chargeroamwh.pdf
    • https://cdn-cms.f-static.net/uploads/4389085/normal_602b87879d657.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_17a9576aefb7492bb915df7c835f50ef.pdf?index=true
    • http://kugajevekafino.myartsonline.com/lista_de_medicamentos_anticoagulantes.pdf
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_9700783e8e9d4641bfae40786642b7af.pdf?index=true
    • https://s3.amazonaws.com/sugowubuf/wikat.pdf
    • https://s3.amazonaws.com/jokotaziweluge/what_is_the_difference_between_the_gopro_hero_7_black_white_and_silver.pdf
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_afa000237772490a86c11ce222638ebb.pdf?index=true
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_4beb49500bcb4d25aabf7257992ccb27.pdf?index=true
    • https://s3.amazonaws.com/bokelur/bixoj.pdf
    • https://s3.amazonaws.com/gasodamuza/sony_fs700r_firmware_update.pdf
    • http://lowelomavojezi.myartsonline.com/gasefufinubobifapure.pdf
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_c37a27e4bcac4974ad694fbf7657bcfc.pdf?index=true
    • http://wifofevowogak.onlinewebshop.net/politikal_na_pakikilahok.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd37.bin
5181efc5412afbf880781646f942c45bac7d518cd301aa9fa6c1ff726f4e753f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 5120 bytes
font_01_sfnt_off00010e9b.bin
b8603d10ed468c0dd4d28b1362fbcc604ed29a537aad37f10aa87d58188cca4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9B 11536 bytes

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