Malicious PDF — malware analysis report

Static analysis result for SHA-256 0893abe56598cb51…

MALICIOUS

PDF

76.9 KB Created: 2021-03-15 04:45:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c6f24be275a3fb7cf27c2022b76a4a0e SHA-1: 7dc2bb2da9a9b789091bdc72f3c6f02d767d9d2d SHA-256: 0893abe56598cb5163d739441ddade6fd29b02173f2da41723d71efe93f1573f
66 Risk Score

Malware Insights

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

The PDF file contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and extensive URL usage point towards an attempt to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://xajibur.ru/award?keyword=miopia+astigmatismo+hipermetropia+presbicia+pdf PDF link annotation
    • https://kirimobo.weebly.com/uploads/1/3/1/0/131069812/3438433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_60325307003fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382770/normal_604e8e67df1e3.pdfIn PDF document text
    • http://welitizenowem.mywebcommunity.org/rincian_apbn_2020.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/68242252996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_5fdc18a3a75e7.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/gdpkE2S/tofugokufojedoruda.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxovowupofa/pmOwYjc/338167405.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/gVvidjc/view_photos_on_samsung_tv_from_iphone.pdfIn PDF document text
    • https://mofalapew.weebly.com/uploads/1/3/4/3/134307760/f5617.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443576/normal_5fdec3f035102.pdfIn PDF document text
    • https://cdn.sqhk.co/mabisurud/PjijaNe/jupoxenez.pdfIn PDF document text
    • https://nerapusu.weebly.com/uploads/1/3/1/4/131438180/74209710b3.pdfIn PDF document text
    • https://zevakevo.weebly.com/uploads/1/3/5/4/135400716/nuxusituw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuvuzevo.atwebpages.com/xegogop.pdfIn PDF document text
    • http://belibivizonojo.myartsonline.com/how_to_reset_honeywell_gas_valve_on_water_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/list_and_briefly_define_the_fundamental_security_design_principles.pdfIn PDF document text
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_1411ec39d11d4bc6bbce68d4e9cdcbd5.pdf?index=trueIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_b662075613d6427897236bca4e9c0427.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dojonuta/holcim_philippines_annual_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/battle_trip_episode_153.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC4 5680 bytes
SHA-256: 7bad252efc4e86f652394e76312b66ec66102bce048e34cb989ff76e2680ef98
font_01_sfnt_off0000fdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 11840 bytes
SHA-256: 350d343517324d33e5ed33d9618f8c10deab285aaaf35eb4edbeb7c4f7ee9d0b

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