Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc58139eadda9f3…

MALICIOUS

PDF

126.0 KB Created: 2021-04-14 12:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e67ec421321a1761b8787837b8db73a2 SHA-1: 720cfd33f2ac8051478cac46730f306f1c0c187c SHA-256: ffc58139eadda9f364152ede0b0ba34992a3332936fbef52f169c9521db9520a
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 0.9963

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://xezojetit.ru/strik?utm_term=pandas+select+rows+by+index+multiindex PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481852/normal_6009d60c16375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476122/normal_603d4202d452e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500877/normal_5fffb43cd282c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393489/normal_6010e452a8b23.pdfIn PDF document text
    • http://tugidunamoz.22web.org/gunofapiputifit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406789/normal_602df0ab2ddfa.pdfIn PDF document text
    • http://kerosijuvibeg.scienceontheweb.net/navutupalizonigumol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491688/normal_606e522fc3032.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/robotawomeluvemezegilik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426260/normal_60647fd50bca3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450356/normal_6055006af3193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_60216e0f9b176.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://uploads.strikinglycdn.com/files/a23618f4-67fc-4528-8207-86a89a247cda/79178321530.pdfIn PDF document text
    • http://paguvano.epizy.com/vidmate_install_for_pc.pdfIn PDF document text
    • http://dupepoge.onlinewebshop.net/52758978129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e2fdc3c-de3a-4aa1-847f-719e1b67f8f8/grohe_ladylux_cafe_33758_parts.pdfIn PDF document text
    • http://suzogoga.epizy.com/2983391852.pdfIn PDF document text
    • http://punolubumima.epizy.com/5153100632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c6df614-009d-4a62-95d6-ccec0833d40a/73147985254.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/76111449022.pdfIn PDF document text
    • http://kiralemosokeze.epizy.com/best_books_on_stock_market_investing_reddit.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/capacitive_fingerprint_sensor.pdfIn PDF document text
    • http://juxugalipexobow.epizy.com/think_of_me_lyrics_phantom_of_the_opera_sierra_boggess.pdfIn PDF document text
    • http://wepilujal.rf.gd/personal_statement_example_for_university_application.pdfIn PDF document text
    • http://tosivasode.epizy.com/39168197872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00c9815b-20bc-41b7-a1ea-14387d9a7f6a/g-shock_rangeman_gw-9400-3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1EC 5372 bytes
SHA-256: d674bdd534ffb2cb1301f0ca2044dad4945140ff1cfbe0c0f70b2d0cda45642d
font_01_sfnt_off0001b421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B421 11516 bytes
SHA-256: bc3f1ac946adcf1c76405d2235a11ae80fa34eb03bd9e6ea260e0d6fe53d7e0d
font_02_sfnt_off0001db96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB96 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f