Malicious PDF — malware analysis report

Static analysis result for SHA-256 f475a99a76de7f40…

MALICIOUS

PDF

78.3 KB Created: 2021-06-06 03:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e6bb021c2ef279bc238d118758860bd SHA-1: 503a64bd0e71a48ab71d0f6343a274cf928537d4 SHA-256: f475a99a76de7f40ff325a139e2d82893007807752df7a4abc0049ecf55af1e6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically advertising 'Btd5 hacked infinite money'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to drive traffic or distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coretry.ru/pbw?utm_term=btd5+hacked+infinite+money
    • https://mixifotosipepe.weebly.com/uploads/1/3/4/8/134875306/de1e8e0fb77c47.pdf
    • https://cdn-cms.f-static.net/uploads/4385216/normal_603ce625b2476.pdf
    • https://static.s123-cdn-static.com/uploads/4456984/normal_5fdf567dd43f7.pdf
    • https://rugufixib.weebly.com/uploads/1/3/4/3/134381394/9137142.pdf
    • https://cdn-cms.f-static.net/uploads/4378834/normal_60255db76a256.pdf
    • https://static.s123-cdn-static.com/uploads/4447278/normal_5fc5fdbb7a893.pdf
    • https://zinurutiman.weebly.com/uploads/1/3/5/2/135295757/6250567.pdf
    • https://futibiwis.weebly.com/uploads/1/3/1/4/131408183/koxabiromukajogifep.pdf
    • https://bumipavadawafez.weebly.com/uploads/1/3/2/7/132710759/9048291.pdf
    • https://static.s123-cdn-static.com/uploads/4497110/normal_5fde24595de12.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fuxedemama.pbworks.com/f/30521743447.pdf
    • https://uploads.strikinglycdn.com/files/b36a05fe-045a-4ee8-8460-ceeb8875d427/rixizuwivaxopelexirutuwem.pdf
    • https://uploads.strikinglycdn.com/files/8b0119c9-ce2c-45f5-99f0-0c9d66e42e6c/gazinit.pdf
    • http://xetibubib.pbworks.com/w/file/fetch/144418002/wolfteam_oyunu_nasl_indirilir.pdf
    • https://uploads.strikinglycdn.com/files/06b47889-899d-4d3b-8b96-b37d20dd0238/17480494975.pdf
    • https://uploads.strikinglycdn.com/files/e0e22c7d-39bb-4e2d-b876-c79358316af0/wozupopijudidagogiva.pdf
    • http://wuxikadafi.pbworks.com/w/file/fetch/144416385/39976624719.pdf
    • https://uploads.strikinglycdn.com/files/24e21937-03e1-4f67-b9da-b313e1332c29/silirukudafebilonar.pdf
    • https://uploads.strikinglycdn.com/files/4c2ec94f-fa45-47af-aa9c-bbab26d1cdbd/acer_t232hl_abmjjz_23-inch.pdf
    • https://uploads.strikinglycdn.com/files/8ad340e8-5757-4938-bdad-b1b25bc28a2a/moto_g_2nd_generation_battery_replacement.pdf
    • https://uploads.strikinglycdn.com/files/2882add6-06b3-4cdf-b875-3ea111e86ff8/how_many_carbs_are_in_a_chick_fil_a_sandwich_without_the_bun.pdf
    • https://uploads.strikinglycdn.com/files/dec5b0ce-cf46-4b97-9bbc-3f37a4c82293/96521303859.pdf
    • https://uploads.strikinglycdn.com/files/5bc1bd71-0153-42df-900e-678ba94c3223/is_there_a_22_ammo_shortage.pdf
    • https://uploads.strikinglycdn.com/files/d66a3ca1-782b-4765-ba5f-ee1b39b92fcd/friday_night_in_atlanta_things_to_do.pdf
    • http://nusuwoxub.pbworks.com/w/file/fetch/144426495/how_to_file_taxes_with_unemployment_florida.pdf
    • https://uploads.strikinglycdn.com/files/f4daa3f4-0151-49cf-9c4b-795d9ac025b1/is_omron_intellisense_accurate.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_off0000f230.bin
051d5646dc650e13cb97c643bbb370e28056a814ec6a7597ae406b29c29e9235		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 5292 bytes
font_01_sfnt_off00010424.bin
b9526de4b66d82ae3f5cb3f3e97b04ff0f4c1fb5878e1cedfe808deab4eae3c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 11740 bytes

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