Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b6c6325f3c925d…

MALICIOUS

PDF

76.6 KB Created: 2021-04-02 23:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f9bb6664d55403dbdfb6fdbe07f0e20c SHA-1: bb5ab21cf79f6eafabca260ceee07c7c046b5785 SHA-256: c1b6c6325f3c925d31e5fcb15bae7c4572442e42efbe504c394a6941f7b3ca7a
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 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/award?keyword=badminton+court+rules+pdf PDF link annotation
    • https://repugololenip.weebly.com/uploads/1/3/4/8/134880500/0d286e5323.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/Jjdgfjb/nubipiworeb.pdfIn PDF document text
    • https://sofamilases.weebly.com/uploads/1/3/5/4/135401016/7e57f25edb1b1.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuxopova/G7hfggQ/texas_holdem_poker_deluxe_on_facebook.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467285/normal_5fcd0b93e4833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448110/normal_605986fad2eb9.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/ngejetv/59311322582.pdfIn PDF document text
    • https://cdn.sqhk.co/sutadejuna/F3gdfii/pixel_squad_dwarka.pdfIn PDF document text
    • https://wetifojijebene.weebly.com/uploads/1/3/4/4/134474841/wejut_lopefotavigo_ranigemanufojif_gigajajosuguro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368762/normal_5ffa831b9c946.pdfIn PDF document text
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/sakumajekoju.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/hgDOhgj/toca_hair_salon_4_hairstyles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476952/normal_6061919bc2ec1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479446/normal_5ff9a4d71e1cd.pdfIn PDF document text
    • https://cdn.sqhk.co/xujurovemu/d5IjbqW/47055831413.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/futamo/rofewekazod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/752306db-5f7f-4fdb-a990-0b5148fe07a9/rizifela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d53f9f-8327-4e78-aa55-aea8410b76fc/engineering_mechanics_statics_3rd_edition_pytel_solution_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/android_10_gesture_navigation_back_button.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/cido_laurico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29486363-638f-4057-9114-ceab1bc2b3c1/muraferewiguxesem.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/40748925523.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/sawosizesedi.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_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 5348 bytes
SHA-256: 5af70a41d662cf0f9be668d80c71e1e7cf0dc711230b2a5cad8dd62948bc2b5c
font_01_sfnt_off00010084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 10840 bytes
SHA-256: ec66221a879c244705c5c6c9fe4d9013b1c7df9ba42e7062fee3f2ef684971f2

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