Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea243db90369859…

MALICIOUS

PDF

74.6 KB Created: 2021-03-14 16:30:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 199a152008c5598ea3b5b0ced852d72d SHA-1: 8c61d88fa62f8de49cf0e1e0ed8ebe2489b6beda SHA-256: aea243db903698592dd5c3c6ec6f87482f650faaaeaabff46db14c0019537b83
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/award?keyword=buses+arquitectura+de+computadoras+pdf PDF link annotation
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/8082911.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/butedakesobevuw_fosetuvu_wezezewelerabe_kigedakonu.pdfIn PDF document text
    • https://cdn.sqhk.co/fufigavaki/ejigd2u/59202012675.pdfIn PDF document text
    • https://dabefetuxof.weebly.com/uploads/1/3/5/3/135320161/6052838.pdfIn PDF document text
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/jijaf.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/gejhOij/speed_night_2_apk.pdfIn PDF document text
    • https://gumewutudeg.weebly.com/uploads/1/3/0/8/130813982/najig.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/jhjhfgh/idle_construction_3d_apk_pure.pdfIn PDF document text
    • https://tugemizibu.weebly.com/uploads/1/3/0/7/130739278/cf330fdfd.pdfIn PDF document text
    • http://vakotuwudar.22web.org/reading_comprehension_b1_british_council.pdfIn PDF document text
    • https://rubebukani.weebly.com/uploads/1/3/0/7/130740450/roparu_wuwulut.pdfIn PDF document text
    • https://punulizi.weebly.com/uploads/1/3/5/9/135957491/mitelipu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_a11df9934d4b41388183bbea63501ad0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f2b1273-414a-419a-a38a-54044423f3bd/gibujuxetudarulonusotugim.pdfIn PDF document text
    • http://sofirenapirovo.rf.gd/46463549736.pdfIn PDF document text
    • http://watitabetunob.epizy.com/beijing_platform_for_action_countries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2498ab96-12fd-40c3-af08-82cea24b297f/how_to_study_for_ib_physics_hl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92673571-d587-4053-ae11-43c003dd5992/59249213238.pdfIn PDF document text
    • http://zotawof.rf.gd/76868380984.pdfIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_7b8fcd91cbc24a878d9ad4acf2acff00.pdf?index=trueIn PDF document text
    • http://es.wikipedia.org/wiki/Bus_%28inform%C3%A1tica%29#/media/File:CIn 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_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 5444 bytes
SHA-256: e4f6052f0c3162104bc19359097eae1e6d134d78037b8456cae4da25fba01243
font_01_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 11752 bytes
SHA-256: 8a71dc9163863550b8699a27d0d2c0aa3573df5db10b7150921ae2942b242530

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