Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d612c9ca3eafa9…

MALICIOUS

PDF

76.0 KB Created: 2021-02-26 10:50:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 491e6c2c9c1c3a7b9b9c92f9226813bb SHA-1: 0b683c979e3e17276e540dcad3f1a58a9f1fa492 SHA-256: c9d612c9ca3eafa9a75b2d1ddf0b271a79c252fc3d250314054e00f570d00c70
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially obfuscated, suggests a lure related to gas heater running costs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation for client execution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=how+much+does+a+rinnai+gas+heater+cost+to+run In PDF document text
    • http://lamakexo.scienceontheweb.net/baii_plus_financial_calculator.pdfIn PDF document text
    • http://shoop-fo.ru/kexoguwovu2x7zv.pdfIn PDF document text
    • http://davavemoj.66ghz.com/sparkle_background_free.pdfIn PDF document text
    • http://sevazumemozoli.22web.org/48440215862.pdfIn PDF document text
    • http://5gusevshop.space/the_art_of_persuasion_aristotles_rhetoric_for_everybody_the_zaytuna_curriculum_seriesa6oh5.pdfIn PDF document text
    • http://latuha.com/jatolinapegozgo1yo.pdfIn PDF document text
    • http://kozovuxe.22web.org/badri_kannada_movie_all_songs.pdfIn PDF document text
    • http://sofebitaxed.iblogger.org/dosokesidagiladel.pdfIn PDF document text
    • http://famekeletiti.iblogger.org/what_was_the_tang_economic_revolution.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vepesupilet.epizy.com/35195553061.pdfIn PDF document text
    • http://wometopususap.rf.gd/woxewijev.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/mobile_games_statistics.pdfIn PDF document text
    • http://wadekazu.epizy.com/carrot_fit_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/short_descriptive_paragraph_examples.pdfIn PDF document text
    • http://raseloxezonavo.epizy.com/chaahat_audio_songs_free.pdfIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/84927715393.pdfIn PDF document text
    • http://ruludamena.epizy.com/georgia_immunization_record_form_3231.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_off0000ed4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4E 5372 bytes
SHA-256: 33b9cbeb79c9b47fc53c2828867986f1808934df30c1069c2c1c4e480768857f
font_01_sfnt_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 10212 bytes
SHA-256: ee3fc862f2deb35c94d21036c23d40e7d617f5c8b2c436f5ace7f01c3a2059bc

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