Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f856e3c83161d84…

MALICIOUS

PDF

82.5 KB Created: 2021-03-07 12:09:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9fb7e0bafa31eb1190c087d20b8eb0e0 SHA-1: f50682111cb5c499c409f595a4d7de8438a1a479 SHA-256: 3f856e3c83161d849460cafa4b0bac25d62daa56a7014e25907819c2ecf9a32a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=fastest+1-99+crafting+rs3 PDF link annotation
    • https://nolulanulupu.weebly.com/uploads/1/3/1/3/131379612/xazodipabotexi.pdfIn PDF document text
    • https://natadafupekex.weebly.com/uploads/1/3/1/8/131856288/6455868.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/extreme_ownership_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/cjbjbgd/likes_and_followers_by_popular_hashtags_for_instagram.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/ggifjgE/taichi_bubble_tea_menu_niagara_falls.pdfIn PDF document text
    • https://cdn.sqhk.co/tifobebe/jdiiEja/21590810558.pdfIn PDF document text
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/tirurilavalab.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/Dgc5WhJ/78619427512.pdfIn PDF document text
    • https://vipavogezeguw.weebly.com/uploads/1/3/1/0/131069860/soxidozija.pdfIn PDF document text
    • https://loxajutuwaguxi.weebly.com/uploads/1/3/2/6/132681393/xovelujotut-guzogugid-gefowoki-fudusipibate.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/fjehdLM/47081160376.pdfIn PDF document text
    • http://diluzadumavotux.getenjoyment.net/kegite.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/volugarakodarovax.pdfIn PDF document text
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/bogawuko.pdfIn PDF document text
    • https://sadejakudabad.weebly.com/uploads/1/3/5/9/135965210/2207011.pdfIn PDF document text
    • https://sejimewopokotas.weebly.com/uploads/1/3/5/3/135350214/kabojekifisapuw.pdfIn PDF document text
    • https://cdn.sqhk.co/zidomirit/XzifigN/warship_battle_3d_apk_mod.pdfIn PDF document text
    • https://melijezaziwoni.weebly.com/uploads/1/3/4/8/134851492/nidunopuj-zekorapin-sawasokorotizij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_5ea3e353669146aaa9adba64cbd173fa.pdf?index=trueIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_66bc50fefb9047b39600e55202f72ec3.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_off00010610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10610 5376 bytes
SHA-256: 9acf557fed3cce391a755e4e7d082d2e7a28b3b4f5fa791e29d7cb67a3bc732b
font_01_sfnt_off00011878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11878 10616 bytes
SHA-256: c8feaacd81ad7b2f6ba1a76d02940b91a8d3b4144d7f634e2a0df5545c878b09

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