Malicious PDF — malware analysis report

Static analysis result for SHA-256 81923814d65c4526…

MALICIOUS

PDF

85.4 KB Created: 2021-03-22 14:53:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5d95257ce22e54d5bd4a53c05d45cc9c SHA-1: e93f6b6e63f8ffe98c285dc76f3818e7de3e33c8 SHA-256: 81923814d65c4526090ccf139ce2444fd68fd5ac2c8be7448a418c6527a6bf9e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed lure. 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 0.9983

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://leonvi.ru/123?utm_term=ssl+vpn+client+mac PDF link annotation
    • https://sarurudadolixo.weebly.com/uploads/1/3/4/6/134644817/262306d37b6605.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427795/normal_5fe15307cd092.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/bls9nAe/66145375033.pdfIn PDF document text
    • http://zvezdasevera.online/apple_ipod_shuffle_3rd_generation_how_to_useufke1.pdfIn PDF document text
    • https://cdn.sqhk.co/mejomusajob/ifoiejc/resume_template_singapore.pdfIn PDF document text
    • http://enots.space/year_6_maths_worksheets_algebrajmxgs.pdfIn PDF document text
    • http://ipoteka.net/jspdf_autotable_column_widthi4bql.pdfIn PDF document text
    • https://cdn.sqhk.co/dunafafaxen/fPgY9W3/the_academy_the_first_riddle_apk_data.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_602da32df36d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_605184f75ca5d.pdfIn PDF document text
    • https://cdn.sqhk.co/kupawusel/iegd0jh/rumble_apparel_sale.pdfIn PDF document text
    • http://huaweistoreukr.xyz/313743765fhtqp.pdfIn PDF document text
    • https://waxogisuges.weebly.com/uploads/1/3/0/7/130776632/9b17a85f4ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409998/normal_5fd121249b67a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_5fdc26ff95c12.pdfIn PDF document text
    • https://ruwuragawani.weebly.com/uploads/1/3/4/3/134383911/girid.pdfIn PDF document text
    • http://characduwe.space/mircea_eliade_le_chamanismekmz5j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sinadi/24266916692.pdfIn PDF document text
    • http://zubikexef.rf.gd/sample_inspection_report_format_excel.pdfIn PDF document text
    • http://guzefokupidato.rf.gd/47491188805.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/nomenclature_of_coordination_compounds_worksheet.pdfIn PDF document text
    • http://mepusafufeja.rf.gd/widufaxiwesis.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/vilep.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/chataignier_taille_de_formation.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/fenabexazirewojonode.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 4824 bytes
SHA-256: f67eed82aa37829c041ed444c8fac1a8ecada347f1af081d24fd985ebcef33b4
font_01_sfnt_off0000fd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 12268 bytes
SHA-256: 220f453e90ac2235889659df17eb6a5013dd68284917d5fae92adb2894e6920a
font_02_sfnt_off000124d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D2 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953
font_03_sfnt_off0001396c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34