Malicious PDF — malware analysis report

Static analysis result for SHA-256 187eeeb0c120af2b…

MALICIOUS

PDF

73.4 KB Created: 2021-04-30 11:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0dfef8a61b57cd54cb8495521250b338 SHA-1: 8d87b02fa8475bb179dc54a182c26d13938f70b1 SHA-256: 187eeeb0c120af2b813b2209a133ee3aea61a0519fd03aa0e92892a5256e8219
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=new+england+roast+beef+recipe PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465938/normal_5ff65ac91f9ca.pdfIn PDF document text
    • https://subegudikowezi.weebly.com/uploads/1/3/4/4/134476363/9358677.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/jdihgfr/79380968306.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/hc7hcid/ultimate_horse_simulator_2_bosses.pdfIn PDF document text
    • https://cdn.sqhk.co/xukerejolar/flhcidv/30213472878.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494432/normal_5fc9d6f60808f.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/Tgjt9hj/screen_time_apple_iphone_7.pdfIn PDF document text
    • https://wenuzivubog.weebly.com/uploads/1/3/5/3/135392435/nazababezaxezoj.pdfIn PDF document text
    • https://sutesesa.weebly.com/uploads/1/3/4/8/134871168/gowafosupesilu_lapimumitexa_doriv.pdfIn PDF document text
    • https://cdn.sqhk.co/webunojixisa/QX4Fghg/red_white_blue_white_red_horizontal_flag_country.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379606/normal_5ff809432fbfe.pdfIn PDF document text
    • https://dururamud.weebly.com/uploads/1/3/4/8/134846475/xadalate_jeguzajufoxa_waxegotafasob.pdfIn PDF document text
    • https://cdn.sqhk.co/rokunufoleti/hal4NO9/unfinished_wood_halloween_cutouts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469104/normal_5fd6b050a644a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_604623e28bd47.pdfIn PDF document text
    • https://rorenaziva.weebly.com/uploads/1/3/1/8/131871817/namorodo.pdfIn PDF document text
    • https://cdn.sqhk.co/fefavezevir/ijqZ7ii/datojelolamidazafujiveni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_82400fb6a36a400491e45febbd99f2a2.pdf?index=trueIn PDF document text
    • https://0c7b1e5d-10e9-4c66-9a64-57e6babc74f3.filesusr.com/ugd/6b59ba_8ac5c273547448a8a58913d43abc3679.pdf?index=trueIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_5d731557a7aa46fea80f0b6a053d3e3b.pdf?index=trueIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_4309aa2cf2e84066a870faf66bf22de3.pdf?index=trueIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_bfc4fbf37930415784737c6b0c3e8da8.pdf?index=trueIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_7e11fc28fa674843877dbd757a678f67.pdf?index=trueIn 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_off0000e0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 5524 bytes
SHA-256: cf3486b6facf077d9ac8154d44bc28278bf3e88398881ed3c99535e39511be4d
font_01_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 10588 bytes
SHA-256: 32874d6a8cb9b4217369611780454db66269e60b3b487c6cbd0d106762505849