Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce79d8028a1b2e4b…

MALICIOUS

PDF

77.0 KB Created: 2021-03-12 21:43:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 755624e57cddee494f6e92a800421576 SHA-1: 93406cc3ed1a2d2e4224ab7c61a72ff3f805c782 SHA-256: ce79d8028a1b2e4b834dc012e8bcc4146c1cd99b716e83fc8f6af0991de8e171
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://seumenha.ru/award?keyword=adrienne+rich+compulsory+heterosexuality+pdf PDF link annotation
    • https://cdn.sqhk.co/gujuvizaja/ohgKijt/president_2020_polls_fox.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/ekhezrD/11319244893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485436/normal_601295c46be48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488807/normal_5fff2451cb965.pdfIn PDF document text
    • http://balonedud.iblogger.org/best_animation_apps_for_android_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/6he1hhm/crossword_clues_solved.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/cjhVif3/average_lifespan_of_mynah_bird.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/42321127876.pdfIn PDF document text
    • http://wutukuk.22web.org/careers_in_performing_arts_administration.pdfIn PDF document text
    • http://jerijoba.iblogger.org/govev.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/lorifumofelu/wupofasajas.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/90638834750.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/lugakubi.pdfIn PDF document text
    • http://lipitesagodat.epizy.com/jogagopadazigelefovuwo.pdfIn PDF document text
    • http://bigagapafobari.rf.gd/4542711920.pdfIn PDF document text
    • http://basatesizisil.rf.gd/witukimazanusem.pdfIn PDF document text
    • http://jadokekuw.rf.gd/cyberpower_gaming_pc_wont_turn_on.pdfIn PDF document text
    • http://wenimawibi.epizy.com/free_iemu_ios_emulator_for_android.pdfIn PDF document text
    • http://pumejak.rf.gd/sunozujedu.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_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 5556 bytes
SHA-256: 5701efc00dd73a3cea920d82f95478308006d038550df97b290bfb22ee9e4285
font_01_sfnt_off0000fe5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5D 12444 bytes
SHA-256: 714ab7697acb50f8dd1d8842a5b14e4df9466d61599e1ed474704790db7772e4

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