Malicious PDF — malware analysis report

Static analysis result for SHA-256 7139542a21b9aa25…

MALICIOUS

PDF

77.9 KB Created: 2021-03-14 12:33:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4e4e2d3644ca84c82a738d136133f1da SHA-1: 9c7a1435366cdbdcc941209fb5beff343d6fcc5a SHA-256: 7139542a21b9aa2592e09e1ebb74b3c44d92db5026e5e426e12fcad365fa1e58
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary lure appears to be a "dragon city gems hack" to entice users to click on these links, which likely lead to further malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://xezojetit.ru/wix?keyword=dragon+city+gems+hack+android+apk PDF link annotation
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/gigojula.pdfIn PDF document text
    • https://kobafanosige.weebly.com/uploads/1/3/4/0/134016660/kefavijazugananujemi.pdfIn PDF document text
    • https://votokivefanatu.weebly.com/uploads/1/3/1/4/131453133/2202602.pdfIn PDF document text
    • https://lufisadoxusixa.weebly.com/uploads/1/3/4/5/134583632/36276.pdfIn PDF document text
    • https://juxipibofo.weebly.com/uploads/1/3/5/9/135985723/6084243.pdfIn PDF document text
    • http://xusakarezexalu.iblogger.org/xosorevalazikulimesekinaw.pdfIn PDF document text
    • https://suzixibaru.weebly.com/uploads/1/3/4/7/134709676/9de0416f24ea.pdfIn PDF document text
    • https://zanefasijim.weebly.com/uploads/1/3/5/9/135965469/9787818.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://javonipuro.epizy.com/mudefivegotudawivuwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91fb4af6-58a0-48c3-9af4-d43064a1157d/lojavofakejavuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f218fe-5f2e-4251-b3c1-cd87e484956d/27776353484.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_dc7d13e23d7544cc8c67e2152c92791d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d8ce7df-d856-4d9b-a427-4e47e0355ae4/24387760067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d36e14-eb58-43f2-a96a-4745288b23cb/summary_of_stopping_by_woods_on_a_snowy_evening_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/249c22d0-8736-4267-87a0-198ac3e6dbc3/dasedi.pdfIn PDF document text
    • http://tugevajelijivo.rf.gd/dotiwamurixepovuluvek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28a77f4d-6fc9-4260-a288-d8d24807501f/takabafafoduwireb.pdfIn PDF document text
    • http://mevonaku.rf.gd/37061314212.pdfIn PDF document text
    • http://kerakuwopimarin.epizy.com/spider_solitaire_free_for_desktop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26284402-1bf2-4eb6-9ce8-964b96e2a47b/61082823182.pdfIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_973a8fafed0c42458c124302296afc07.pdf?index=trueIn PDF document text
    • https://e72deea9-3c4d-48de-8429-d2e8e2d5d9b3.filesusr.com/ugd/68b2df_2d17a028e56d45ca90125a16feed0870.pdf?index=trueIn 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_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 5620 bytes
SHA-256: 71a2d30de0847b6f40e089c534b78bc254928a69b11ba2eed9f6bed50c7100c3
font_01_sfnt_off00010258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 11576 bytes
SHA-256: b807d4f81c8faac9e712c5ecc4c4dc1e3cfdb6c4fc014b14494d3b3d65983a43