Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba2a23ab45afb28…

MALICIOUS

PDF

71.3 KB Created: 2021-06-11 04:40:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95bc3ca8bc4fa31e16b4ed6f77389bd4 SHA-1: 735224d1e7cfbf8d237ee2beced5ea9463d79e82 SHA-256: 6ba2a23ab45afb2806c3b9c25a70aa637c91bbba13eca6eaa610296e696b6b38
156 Risk Score

Malware Insights

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

This PDF file contains numerous external links, with a significant number pointing to potentially malicious or link-farmed content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to redirect users to external sites, likely for malicious purposes such as credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/pbw?utm_term=i+watch+series+5+and+6+difference
    • https://static.s123-cdn-static.com/uploads/4367622/normal_5fdebd287a817.pdf
    • https://gofizunesiwez.weebly.com/uploads/1/3/0/8/130874053/fojineniviro_wunovuzetidil_pudop_gelini.pdf
    • https://nugebivubof.weebly.com/uploads/1/3/4/5/134591316/7283036.pdf
    • https://static.s123-cdn-static.com/uploads/4378852/normal_5fdf1fabde3b2.pdf
    • https://bamususifilozok.weebly.com/uploads/1/3/1/3/131383301/66489f6cdbcb4.pdf
    • https://cdn-cms.f-static.net/uploads/4486743/normal_6028e4edb3540.pdf
    • https://molulodanewiv.weebly.com/uploads/1/3/1/6/131606256/4354035.pdf
    • https://cdn-cms.f-static.net/uploads/4458621/normal_6063185ab68c5.pdf
    • https://cdn-cms.f-static.net/uploads/4374198/normal_60b8349aca5d0.pdf
    • https://jositaloj.weebly.com/uploads/1/3/4/0/134042718/3534d0c68c2e5d.pdf
    • https://static.s123-cdn-static.com/uploads/4495686/normal_5ff54169e3116.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/617014b7-08ae-4909-8a50-d171cc483332/what_is_the_definition_of_physical_education.pdf
    • https://uploads.strikinglycdn.com/files/bdb00884-c101-47a5-9e78-18fb32298907/why_does_my_netgear_router_keep_dropping_out.pdf
    • https://uploads.strikinglycdn.com/files/393106f4-f22c-412f-9205-d7990e303aa6/bob_stroller_revolution_ce.pdf
    • https://uploads.strikinglycdn.com/files/3712d720-6957-4159-ad10-97ea1df90c97/zadoxijelo.pdf
    • https://uploads.strikinglycdn.com/files/70430b4e-41f0-4b2b-a508-b11174436b6d/nutrition_ebook_free_download.pdf
    • https://uploads.strikinglycdn.com/files/872d4d23-b446-41fb-9a3f-0ac9d8f9f4a5/historia_do_brasil_cronologia.pdf
    • http://fujiserefi.pbworks.com/f/como_descargar_king_of_fighters_2002_magic_plus_2_para_pc.pdf
    • https://uploads.strikinglycdn.com/files/9d717c61-af40-4aba-a5f2-57ce9dd7a413/30054776568.pdf
    • http://zanonot.pbworks.com/w/file/fetch/144871086/fallout_4_all_weapon_mod_glitch.pdf
    • http://zufiwuz.pbworks.com/f/niranemivokakumojapipo.pdf
    • http://tusoxefum.pbworks.com/w/file/fetch/144581433/dividing_fractions_worksheet_grade_4.pdf
    • http://gaguseka.pbworks.com/w/file/fetch/144606399/bafubigi.pdf
    • https://uploads.strikinglycdn.com/files/882d05ad-8a86-404f-a5c9-6592547b397e/art_of_seduction_types_of_victims.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_off0000dcb1.bin
f5c62a37de3219f0127bd94f222b538911d51fbdd2bf3e13c3919a514387f453		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 5384 bytes
font_01_sfnt_off0000ef15.bin
f9cb7e6367feb23d364ffe56ab3943ed809f1d914981ae90b666f07a6e131087		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 9560 bytes

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