Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4cb9fec2bb2c03…

MALICIOUS

PDF

99.6 KB Created: 2021-03-26 07:39:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f00f0a7d648fd1a9f37406e12c8dc240 SHA-1: 7399302b15f1a46ead958fdaaf634eac4d9bf0ab SHA-256: 7a4cb9fec2bb2c03558bfe44187e3fcce9792cf40c1efcf9fbb1aea62bf0d125
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 0.9994

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://dafemum.ru/123?utm_term=aditi+bhatia+images PDF link annotation
    • http://vowitufafuzebil.scienceontheweb.net/mathematical_statistics_jun_shao_download.pdfIn PDF document text
    • http://vixemifojetinag.sportsontheweb.net/deontological_ethical_theory.pdfIn PDF document text
    • http://burivuvuju.medianewsonline.com/head_first_solid_principles.pdfIn PDF document text
    • http://melowimaz.getenjoyment.net/bukawubodedadates.pdfIn PDF document text
    • http://fegokodelaxen.scienceontheweb.net/99366894453.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/80018926759.pdfIn PDF document text
    • http://derifupiwa.mypressonline.com/bodovijulumanezuponorapur.pdfIn PDF document text
    • http://kafujaguvo.mygamesonline.org/88832829548.pdfIn PDF document text
    • http://wedudixunuluwef.iblogger.org/what_are_the_four_main_points_of_darwins_theory_of_natural_selection.pdfIn PDF document text
    • http://gopusoduj.mygamesonline.org/61240673300.pdfIn PDF document text
    • http://pipavinekiga.mywebcommunity.org/fiwixaguxizukis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pevogikuxupeja.onlinewebshop.net/javulom.pdfIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_362a074a51144045aae5824ac27b4726.pdf?index=trueIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_2f270fb37ebb44828dde3e48a5d2bb2c.pdf?index=trueIn PDF document text
    • http://pusevim.epizy.com/descargar_libro_de_cero_a_uno.pdfIn PDF document text
    • http://borufaf.rf.gd/effects_of_alcohol_on_health.pdfIn PDF document text
    • http://sosozodazu.epizy.com/79336121096.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/gospel_of_the_twelve_holy_apostles.pdfIn PDF document text
    • http://tefokade.epizy.com/descriptive_writing_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/auto_tap_android_no_root_no_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/36723996626.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/relizokojaxefusubij.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/baixar_reader_adobe.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_off00014822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14822 5240 bytes
SHA-256: 50cda3327abed5ec20eb00a4e7a95aa745287dd30517f2cca0464c19ea86da37
font_01_sfnt_off000159ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CA 11640 bytes
SHA-256: 6e032930471435aba800c32a2184fe1052cd123b6fb623bc3c029d4932bdf988

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