Malicious PDF — malware analysis report

Static analysis result for SHA-256 3750f602d2adf28b…

MALICIOUS

PDF

80.0 KB Created: 2021-02-28 21:26:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d24a20d969980513c0ca9d89ff25a808 SHA-1: 1001f3b7719191d162949477d3b10e8fc1ad4fc8 SHA-256: 3750f602d2adf28bae95fc3965a64fee71d7dbd5e46f7290e524a80401f8fa45
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://kuzutuzo.ru/123?utm_term=are+char+broil+gas+grills+good PDF link annotation
    • http://kefets.xyz/download_journey_to_the_center_of_the_earth_in_hindi_480pbq9bf.pdfIn PDF document text
    • http://mini-cam1.club/parabolas_worksheet_algebra_2da1r2.pdfIn PDF document text
    • http://peluxuba.sportsontheweb.net/xedak.pdfIn PDF document text
    • http://kipokefurur.mygamesonline.org/fosoran.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/how_to_make_your_own_google_cardboard_vr.pdfIn PDF document text
    • http://ouily.xyz/how_to_sew_fast_flying_geeseujhbs.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/igjgcie/rujibavetegedotododor.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/gvNl1S7/wbt_radio_live.pdfIn PDF document text
    • http://detonic-buy.website/europa_baby_palisades_instructionskvadl.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/jeRig6E/tujikamewavagejafativ.pdfIn PDF document text
    • http://xesapuwax.mywebcommunity.org/sql_server_configuration.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/amadijc/85178449203.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/iejewdf/pisefaxafodikikurivivu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xipanizi.myartsonline.com/what_are_the_5_main_personality_types.pdfIn PDF document text
    • http://xonefepuvimami.epizy.com/rolupulekobiwimulipejup.pdfIn PDF document text
    • http://vobujilub.epizy.com/bazesamazof.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_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 5328 bytes
SHA-256: 6dcc0b3a8cc92511df35032214f11dcc1a13bf7047038b330644bdf1bcbf89e2
font_01_sfnt_off00010d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D31 11136 bytes
SHA-256: 1d1077a245ab9c95da4bf7eeacd0b108a0bbee5e6c445a603670bd7686d351b7

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