Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df945be85df1326…

MALICIOUS

PDF

94.6 KB Created: 2021-05-16 20:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f2bdfe7ec440e0ea3ac65f2f8540209d SHA-1: 12f5b36aa4edb60c0b1c35e451c771d25b0f58a0 SHA-256: 8df945be85df132646fa3c7d522e986af139c93d41fb5150a2d9876d270aa900
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9992

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=baofeng+uv-5r+manual+espa%25C3%25B1ol+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366620/normal_602575961bccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_5fda53598eaac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496605/normal_603419baf0abd.pdfIn PDF document text
    • http://wigosixozem.mywebcommunity.org/bible_quiz_with_answers_for_youth_in_tamil.pdfIn PDF document text
    • http://pesuzukotejoki.iblogger.org/piluwewuzokol.pdfIn PDF document text
    • http://evatopshop.xyz/sururuxikotobonurekolmsppn.pdfIn PDF document text
    • http://bizifemodefi.mygamesonline.org/80280241850.pdfIn PDF document text
    • http://reduslim-buy.site/the_12th_planet_book2r49w.pdfIn PDF document text
    • http://desokore.medianewsonline.com/kufizonizilaruji.pdfIn PDF document text
    • https://cdn.sqhk.co/mavozopofug/Ghgijja/siwawatawinoderokisidize.pdfIn PDF document text
    • http://appletopshop.ru/2501833846699puz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454665/normal_6002bf680aeda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370778/normal_6005639a90ec7.pdfIn PDF document text
    • http://energierecrute-emplois.com/calculer_taux_de_variation_formulewy79k.pdfIn PDF document text
    • https://cdn.sqhk.co/kupodakojav/4iahdz8/academic_information_management_test.pdfIn PDF document text
    • http://jurojegame.getenjoyment.net/98712899434.pdfIn PDF document text
    • http://vobigabifinu.22web.org/corruption_of_champions_guide.pdfIn PDF document text
    • http://rakapugijumub.sportsontheweb.net/radotevefeleralerodexewof.pdfIn PDF document text
    • http://prequester.online/9144798341nrjsn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_f6d35db0207148439f80854521d46f7a.pdf?index=trueIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_f26efa6e94444297807251fba1d89bb6.pdf?index=trueIn PDF document text
    • https://9ffa65b4-b95e-481c-977d-2cf6acaa57d7.filesusr.com/ugd/f68d46_d208e67eeb524662b8c7b15a82cf7b7b.pdf?index=trueIn PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_f62ec8f3a37448968ec513d74fb069e1.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_off000131b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B5 5836 bytes
SHA-256: ebe02bb1c4e97448506f59b3aa669d44dbad6280d3099be7eec1e041782ddc2a
font_01_sfnt_off00014557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14557 10968 bytes
SHA-256: 4943866d536a3fe40ff13513bc9316b4eeb602139a5bac651abe17d770fe4b05