Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1312033d932765f…

MALICIOUS

PDF

84.0 KB Created: 2021-05-13 23:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2b5fada752933f2ec3e8a141d8055abe SHA-1: dd9663e748bbac6bc29c334f99dd1257cde4a1cc SHA-256: e1312033d932765f2b2a23a1a6556a44afcc0e196cf8ee1515ad59a0fafd9572
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 0.9991

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://jottigo.ru/strik?utm_term=2nd+grade+math+workbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452173/normal_605b606e950c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418981/normal_5ffdc3510ea38.pdfIn PDF document text
    • http://topitoxituzoju.iblogger.org/how_many_companies_are_listed_on_the_stock_exchange.pdfIn PDF document text
    • http://fruktovik.com/vapor_flask_classic_uktq5h8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478378/normal_6018313f765c9.pdfIn PDF document text
    • http://businessoutsourcing.info/60122990528gzn5r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416666/normal_604b15248f983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486552/normal_6060f52b0cf3e.pdfIn PDF document text
    • http://devlp.club/hip_arthroscopy_portalsmglwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/merit_badge_counselors_near_me.pdfIn PDF document text
    • https://f3b86e06-b3aa-4ee1-82f7-79049f3379a8.filesusr.com/ugd/0c4fd2_d3712c9b629c44afa8282769672e6eab.pdf?index=trueIn PDF document text
    • http://wigifanike.epizy.com/slaves_to_darkness_paint_schemes.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/como_configurar_o_wireless-n_ap_repeater_router.pdfIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_249dd7514235482fbd687f99f6b29894.pdf?index=trueIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_fea7ba9055534f7580930b13bd0bb341.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/6th_std_english_guide.pdfIn PDF document text
    • http://vavarogusofu.epizy.com/hindu_astrology.pdfIn PDF document text
    • http://pesuvomekujidi.rf.gd/44242237040.pdfIn PDF document text
    • http://mimosomudex.rf.gd/invensys_pension_scheme_annual_report.pdfIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_e07d05c76341443a910104ca35126448.pdf?index=trueIn PDF document text
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_bd8d525193544abeaa0526992d315d9b.pdf?index=trueIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_744f8f60e1684e52b04ccf3c5ee9aa6a.pdf?index=trueIn PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_0974b650be484880b4b1c6f1e2430b31.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/xivulobitewapuxefaxas.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_off00010a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 5576 bytes
SHA-256: 25f7a156c59ddb3c10a60740c3ecdc1a146deef31e76ead66456acf92d9c3f13
font_01_sfnt_off00011cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFA 10968 bytes
SHA-256: 6d919653648c91ea3a0f422d77216ede81db3c11e208a63eab7af18b5f1639f4