Malicious PDF — malware analysis report

Static analysis result for SHA-256 806caa9a87108df2…

MALICIOUS

PDF

77.9 KB Created: 2021-06-11 05:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fcb78c4822ca69a966c399daf57bfc22 SHA-1: ccebe497034629ffe206bea0c737b57ceebc856e SHA-256: 806caa9a87108df20229569db5fada1eca6894903d0f624e669ada34d18aebbe
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable hosting services, suggesting it functions as a link farm for SEO manipulation or to distribute further malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://coretry.ru/pbw?utm_term=rise+of+skywalker+adam+driver PDF link annotation
    • https://vanawolibonute.weebly.com/uploads/1/3/4/3/134344109/1707403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407299/normal_605b4002be0f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366969/normal_5ff717fa3f958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530457/normal_60173234d7fd9.pdfIn PDF document text
    • https://bemetapijulew.weebly.com/uploads/1/3/1/4/131437656/bogipowokijavoronema.pdfIn PDF document text
    • https://guxewegitonis.weebly.com/uploads/1/3/4/3/134336720/jolomajutu.pdfIn PDF document text
    • https://lepefolavexar.weebly.com/uploads/1/3/0/8/130874674/mozizex.pdfIn PDF document text
    • https://koxamuru.weebly.com/uploads/1/3/4/8/134890845/3378858.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383138/normal_5fe13c20c31c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496372/normal_6018091d8d49b.pdfIn PDF document text
    • https://xinorexuvon.weebly.com/uploads/1/3/4/6/134608307/6451821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443802/normal_5fe5e1e76475e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4392860/normal_60b319fabc97d.pdfIn PDF document text
    • https://wirolarem.weebly.com/uploads/1/3/1/6/131636642/6575712.pdfIn PDF document text
    • https://duloduwo.weebly.com/uploads/1/3/4/8/134850843/2095732.pdfIn PDF document text
    • https://moremutinujiti.weebly.com/uploads/1/3/4/8/134865562/d688e792fc3.pdfIn PDF document text
    • https://vugadeji.weebly.com/uploads/1/3/1/4/131406436/1149468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449000/normal_603d3c9945d6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a690a8a1-8e5b-48e4-84f3-778809a1395b/fukivoguvor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf55043-f0c1-4a9b-99c2-0a4307968552/pufemubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d90d1af4-5528-40cc-852e-5b2db794aebf/6560392816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d52fcd-399d-463c-ac14-85924868762d/wabuvuxaduvuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee722ed6-0a46-4ca4-a0c9-836a0b0f1139/11443026073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca0beb24-7348-45a7-b262-719f959167a1/vowofopava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c999d175-c841-480c-93d4-70d6c2324998/how_to_change_from_grams_to_ounces_on_polder_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c691bb-ed78-48bc-9578-3ef2f0dc54ba/the_hunger_games_mockingjay_part_1_free_online.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 5376 bytes
SHA-256: d1266cb0f2731bd64b7d0bcef3ccae180e1cb1fd9a4950cc630b961537c13d41
font_01_sfnt_off0000f742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 1936 bytes
SHA-256: 7420db9ec41012b263dff8e0d039d2a895961a6b4c1647eabbcd20f441fad98a
font_02_sfnt_off00010089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10089 12024 bytes
SHA-256: dc4f182f8200016acd6877c91ad21d15c7d53813bad6c649751db6f1667435ce

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