Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b55e31b6312d05f…

MALICIOUS

PDF

88.5 KB Created: 2021-03-21 02:50:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2d5a1e7ce831ad54b42ed4fc958e304f SHA-1: f9fe53c2a39b6d4512a795d3bfd7ba380a9e9e7d SHA-256: 4b55e31b6312d05f8bc722a3ee88fda42ff82b94b8ad94712aff2b41a51de50f
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 0.9997

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://xajibur.ru/aws?utm_term=confidence+adjustable+walking+desk+and+treadmill PDF link annotation
    • http://lnstagaram-verifiedbadges-from.com/angry_bird_2_mod_apk_data6gq46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495271/normal_60039c8d81f74.pdfIn PDF document text
    • http://tk-time.site/zifabawibowataniljtxgl.pdfIn PDF document text
    • http://podcard2020.site/8514155259305t1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528780/normal_601af90a84957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_6041956abb9e0.pdfIn PDF document text
    • https://wopopodixela.weebly.com/uploads/1/3/0/9/130969383/xisetewurapijagep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449187/normal_5ff432f86163b.pdfIn PDF document text
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/83945eee1f0a67c.pdfIn PDF document text
    • http://salonop.xyz/49907172076nlur4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417037/normal_6025ac59ed93c.pdfIn PDF document text
    • https://mumizajasaliso.weebly.com/uploads/1/3/4/5/134598274/dikutajalovovisi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/32fb9462-feee-489f-a3ad-56a0aa6691a8/medio_de_comunicacion_mas_antiguo_del_mundo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8d28acd-9f51-4ea3-916f-87dffeeacd1a/67581025078.pdfIn PDF document text
    • http://mupevisad.epizy.com/tl-wr841n_firmware_v9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc968667-96de-4622-94ed-9b9dadd7a9b5/dollhouse_pole_dance_studio.pdfIn PDF document text
    • http://nevozabewovezo.epizy.com/new_home_antique_sewing_machine_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61fcc257-8cdd-464b-976e-9d24f117e1cb/83551543476.pdfIn PDF document text
    • http://dikekonigexixa.epizy.com/54068774945.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/beethoven_symphony_no_5_music_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/90609693251.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_off00011c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C09 5620 bytes
SHA-256: 41a0bf332dd88fdce6002ff83fc3e7030e2217ab70e23b01ea664f693072fc90
font_01_sfnt_off00012f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2B 10996 bytes
SHA-256: ec135058e5b7460c6a037f92cbb962261b019b2fa055fa3cb7d85ab3f3298a8d

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