Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b1109b607c9f54…

MALICIOUS

PDF

77.3 KB Created: 2021-05-20 19:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1c64f1fff2f62e850cdf011737e74bc SHA-1: 5f1982c4219285114c3b4f24730ae7833b7b3b12 SHA-256: 82b1109b607c9f54b6fcee713e18038ef5e557210fbaf740dab96e67a8c6ab13
194 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a URL related to 'clash royale hack server' indicates a lure for potentially unwanted or malicious software. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/strik?utm_term=clash+royale+hack+server+android+1
    • https://mejebepagomuda.weebly.com/uploads/1/3/4/4/134494428/kudujomifalonekur.pdf
    • https://dovidememalow.weebly.com/uploads/1/3/4/6/134601329/6948112e02d70f.pdf
    • https://vojufutevale.weebly.com/uploads/1/3/4/5/134521456/mubizewuxiv.pdf
    • https://rusuzewaridoxi.weebly.com/uploads/1/3/4/7/134761315/540a7.pdf
    • https://wetebofi.weebly.com/uploads/1/3/1/6/131608016/nebuseku.pdf
    • https://vibikawezawu.weebly.com/uploads/1/3/4/7/134734059/lufif_roselexivalar_memug.pdf
    • https://xifalazixaxidig.weebly.com/uploads/1/3/0/8/130874217/8f74a2.pdf
    • https://guxodobozit.weebly.com/uploads/1/3/4/3/134333536/2233292.pdf
    • https://jufesuzukexo.weebly.com/uploads/1/3/5/2/135294717/4993640.pdf
    • https://degulula.weebly.com/uploads/1/3/1/0/131070998/6162155.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5eba6e6b-8bbc-41ba-ae1f-3cdefde4bdee/can_i_learn_reiki_online_for_free.pdf
    • https://s3.amazonaws.com/vufupu/sofupuwufutonibonew.pdf
    • https://uploads.strikinglycdn.com/files/19f7f4ce-6be9-49a0-8e84-c982e6069f13/44004837072.pdf
    • https://s3.amazonaws.com/tuxutedi/cricinformer_live_score.pdf
    • https://uploads.strikinglycdn.com/files/37cf33bd-7854-4b07-9933-fee8691728e7/professional_ethics_book_in_tamil.pdf
    • https://s3.amazonaws.com/nonipesikiri/gewitugi.pdf
    • https://s3.amazonaws.com/gogoxowiniza/whatsapp_messenger_for_android_old_version.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f092.bin
90afe41ad8b39a58de846952330c3806044cda6793e3cc63a5105e14afe45deb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 5212 bytes
font_01_sfnt_off00010250.bin
1e6c27c2183eddf907789ba6dd2b72360588aba0b0c3a77ef95099898666eb54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 11216 bytes

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