Malicious PDF — malware analysis report

Static analysis result for SHA-256 81072c0af12cf612…

MALICIOUS

PDF

75.5 KB Created: 2021-04-03 15:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 08de88af7e636cf1bb616322ba3e87b0 SHA-1: c2b371cca8a5421b2c64ef88c01129e8c7745e50 SHA-256: 81072c0af12cf61210688516ca83520f6c248f369cbe2c6731441f7c630a47f2
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains keywords related to 'budget' and 'vision ias', suggesting a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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/award?keyword=union+budget+2020+pdf+vision+ias PDF link annotation
    • http://edayafar.xyz/fuzixiruyjoq.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/56642637874.pdfIn PDF document text
    • http://pidawudimo.scienceontheweb.net/college_cookbook.pdfIn PDF document text
    • http://cherrypimp.online/wogelilu87704.pdfIn PDF document text
    • http://difulomutanuv.iblogger.org/speaker_meaning_in_semantics.pdfIn PDF document text
    • http://juraxoxodas.scienceontheweb.net/pinifegit.pdfIn PDF document text
    • http://vovavipegum.getenjoyment.net/nijebexovafa.pdfIn PDF document text
    • http://naturwows.space/body_temp_android_apph5md4.pdfIn PDF document text
    • http://duduwinal.22web.org/61369444285.pdfIn PDF document text
    • http://hydrofthol.space/zadumotonebuxivipdrggl.pdfIn PDF document text
    • http://maska-respirator.com/word_count_program_in_hadoop_mapreduceuqszw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/wobiporadevazolo.pdfIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_2b70b3e424394170b9f9be2dd5d6272a.pdf?index=trueIn PDF document text
    • http://poxelisenaxoxig.epizy.com/cuatro_convenios_de_ginebra.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/61494831642.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/ragnarok_m_eternal_love_assassin_cross_guide.pdfIn PDF document text
    • http://kegotetebam.epizy.com/rpg_maker_mv_sprite_sheet_template.pdfIn PDF document text
    • http://xubudexev.epizy.com/vorodonugunirixisugobu.pdfIn PDF document text
    • https://969948a0-d7f7-4827-958e-a3856fee42d4.filesusr.com/ugd/9d40bc_67f1409bc96141c4a6658d6d3b3d8f81.pdf?index=trueIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_931d57eb1fca4a42b54b1821a57523b8.pdf?index=trueIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_5e1c7958519a48fc85cf7dab5fd6791a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/sifirivex.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE574 5548 bytes
SHA-256: e25477c7e0618c541aab42deaf46c13f100c332b2b4785f0a282fc7b1e1172b7
font_01_sfnt_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 11772 bytes
SHA-256: 1855a36954716839aaa2c83bdd4d1ff97667dd37027cbd4527ec20906d81404d

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