Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba819bc2aa97dde…

MALICIOUS

PDF

82.8 KB Created: 2021-03-10 08:10:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c357f47f43b8e37d6cf05ef45f313192 SHA-1: be739456c628682bbd2f5ce7b741669a742cf27d SHA-256: eba819bc2aa97dde93cdaa195f38d33707487dc4dca8c31bdc38df8571b575c4
192 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a link farm hosted on disposable infrastructure. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of embedded URLs and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/strik?utm_term=grounded+theory+methodology+in+information+systems+research In PDF document text
    • http://baffer-shop.space/spotify_mod_apk_android935ko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411717/normal_5fd26fa394042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_60345191d566f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387920/normal_60057e4964fec.pdfIn PDF document text
    • http://organicnu.info/bovowinoxitaraminisewao4koh.pdfIn PDF document text
    • http://ru-1.casa/64755597719ooh0o.pdfIn PDF document text
    • http://item-get.top/jbl_xtreme_2_specs8r7qg.pdfIn PDF document text
    • http://teren.fun/94567367710gfypn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464735/normal_604772a513861.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390381/normal_6001d8109cee7.pdfIn PDF document text
    • http://leafester.online/xasefakogonurebubugesukime57rj.pdfIn PDF document text
    • http://dream-stat.ru/half_mask_template_freex1h0x.pdfIn PDF document text
    • http://homearfes.com/578203080783dxp1.pdfIn PDF document text
    • http://soferijivav.getenjoyment.net/luninexikifobezulagal.pdfIn PDF document text
    • http://drnextact.xyz/dyson_dc25_ball_all-floors_upright_vacuum_cleaner_manuali8d3v.pdfIn PDF document text
    • http://talakam.space/80250058621gioh7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekemelegewimo.atwebpages.com/how_do_you_find_exterior_angles_of_a_polygon.pdfIn PDF document text
    • http://solugivewatewa.myartsonline.com/will_verizon_flip_phones_work_in_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/78317179523.pdfIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/what_colleges_offer_vet_tech.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/bigotunakijudujifavuvir.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_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 5568 bytes
SHA-256: c2eb7199ece1b597748130ae3ea27768dbcf07116d2813cc3ddf754ea7055793
font_01_sfnt_off00011685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11685 12180 bytes
SHA-256: 5cc7b9f76ec8090e8c32e24f916387e1005a72cb249fccb5ccd580e410128d17

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