Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26c5b282e98df8c…

MALICIOUS

PDF

75.1 KB Created: 2021-04-29 09:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ed093ab3f5f34e887978068929556c4 SHA-1: 9fbdf498337e971fc50ece14f662aa805ec26934 SHA-256: a26c5b282e98df8cc7fc65ba296be41cdac9e8cead4b90ceebecba4365ef6e18
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://pelibifir.ru/strik?utm_term=the+shape+of+things+book+you+tube
    • https://cdn.sqhk.co/kojetozativ/bVLtSjg/bhop_pro_mod_apk_1._9._4.pdf
    • https://cdn.sqhk.co/kulobuwaxegu/ghlr8jj/best_eye_color_changer_app_for_android.pdf
    • http://trylait.pro/fun_party_games_no_equipmentqttow.pdf
    • http://nofomunagipu.iblogger.org/vewigu.pdf
    • http://neojust.ru/nexawavyoaie.pdf
    • https://cdn.sqhk.co/pizokifuxe/gjdgcLW/giputigov.pdf
    • http://swast-group.website/viva_bingo_slots_free_casinou3rq2.pdf
    • http://antonioit.space/bihar_board_admit_card_2016sk4of.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ba5d4ca7-777b-4ff7-855d-60fc8da7b8b2.filesusr.com/ugd/29a726_310b9da83cf84fc5b434a05a79e3e336.pdf?index=true
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_97458cb0a6b24d5f86b00d120ec1ebdd.pdf?index=true
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_2247078f573542e5aa02592a374772cc.pdf?index=true
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_a3d5d3e4c4844452806036a2d23ec69a.pdf?index=true
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_6e912e64ff4d47e1b40736d774e4b04a.pdf?index=true
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_35d7daf1df7b42d996d1efb1c0af529e.pdf?index=true
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_cd15d7f4c2f24c11b1cb360d12120918.pdf?index=true
    • https://39dd5e1d-a581-41ec-a80f-9e19245c660f.filesusr.com/ugd/c2656d_4210410687e94d509f7c06e20e368691.pdf?index=true
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_5164fa87345f47c785373132b777444a.pdf?index=true
    • http://timikawimi.rf.gd/pan_card_lost_application_format.pdf
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_e9e8df1ae2b048069f0252d853940a1e.pdf?index=true
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_c3bdc968b1da4433923b257f7a55282c.pdf?index=true
    • https://25cf7bc6-226b-4013-96fa-c64d334b7dac.filesusr.com/ugd/317e1a_44dcceeacc60418aac07c694ee697231.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e466.bin
2000a63af949f91419a33a7bb2c5e113e907f20761b2530c8ad89dee7460c856		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 5288 bytes
font_01_sfnt_off0000f675.bin
01b3f4215329c3688152cdd01e1adf962fd22caa997a14e6f895b58e1bcbd216		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 12004 bytes

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