Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ec95cd94e6a41e…

MALICIOUS

PDF

68.4 KB Created: 2021-04-01 19:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ab0f5f974dfdeccbda098f75b2e1d14e SHA-1: e73cd5fdb6dffd8a42f3e45bff0423b6504590c6 SHA-256: a4ec95cd94e6a41ee35807e8ddc5e8b97e19f84d1cbf3026d6ff9facced310ce
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=find+someone+who+game+worksheet PDF link annotation
    • http://kigetipopizatij.getenjoyment.net/93069645042.pdfIn PDF document text
    • https://cdn.sqhk.co/supekolev/eiiji9u/betupakirojipafa.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/bghSfkt/new_map_san_andreas_for_mcpe.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/baby_goats_bouncing_on_trampoline.pdfIn PDF document text
    • http://xolokeminapi.getenjoyment.net/mavexomovi.pdfIn PDF document text
    • http://believes.space/how_to_use_porter_cable_150_psi_compressornvo5f.pdfIn PDF document text
    • https://cdn.sqhk.co/febenapox/vhj5Zjb/52292931453.pdfIn PDF document text
    • http://wuxixezigitezir.mygamesonline.org/zadania_maturalne_gramatyka_angielski.pdfIn PDF document text
    • http://com-copyrighit.com/biological_diversity_meaning_in_englishpq4in.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/glossary_of_medical_terms.pdfIn PDF document text
    • http://merotudonor.mypressonline.com/akhenaten_and_the_religion_of_light.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/sumesawoxajew/online_converter_image_to.pdfIn PDF document text
    • http://zukavinu.rf.gd/cardinal_newman_high_school_sixth_form.pdfIn PDF document text
    • http://wifofevowogak.onlinewebshop.net/32277784677.pdfIn PDF document text
    • http://xenezipulugiji.atwebpages.com/excel_vba_copy_range_of_cells_into_array.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/bachelorette_invitation_templates_printable.pdfIn PDF document text
    • http://kolixuvurivol.epizy.com/mapa_metro_amsterdam.pdfIn PDF document text
    • http://wedojixote.rf.gd/what_is_the_default_password_for_oracle_11g.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/soundcloud._com_playlist_er.pdfIn PDF document text
    • http://kixasudasiwub.epizy.com/nedinowutapapof.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_off0000cefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFD 5316 bytes
SHA-256: 1af152a3ad67df3005bc98dae8d8165c53cd563fb4d9d7ff87f1bdbfe4665329
font_01_sfnt_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 10260 bytes
SHA-256: 61b1dc7830a549f9f56e002043609d599c0cf398b4de08a4de4f90d7b9a34adb

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