Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a3fa513bc68ed4…

MALICIOUS

PDF

92.8 KB Created: 2021-02-23 07:58:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 81eca8f293727abeb527643d33691678 SHA-1: ecd07681379e36aae53ed13dbc82a7b40b5744e5 SHA-256: c4a3fa513bc68ed409598d9400c2450eca4c2157e187e68dd9e54a393ce455df
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and are designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links and the use of disposable hosting suggest an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=five+minute+mysteries+printable PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389370/normal_5ffef88721f1b.pdfIn PDF document text
    • http://leree4.club/is_fifty_shades_freed_on_netflix_canadaazabg.pdfIn PDF document text
    • http://xavukagidasali.iblogger.org/the_danger_of_a_single_story_ted_talk_worksheet_answers.pdfIn PDF document text
    • http://ttop-shop.com/whatsapp_profile_picture_iphone6ggpl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416318/normal_601287d0a5d51.pdfIn PDF document text
    • http://tonerinkstore.com/uc_browser_java_nokia_x2hx2un.pdfIn PDF document text
    • http://rollernefritmassage.xyz/gugonefovkzc8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414687/normal_5fdfb6654cc26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450340/normal_5fdfd7bf48bc4.pdfIn PDF document text
    • http://monstergym.ru/bujubavebonizafupiqdsan.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/nesn_bruins_scheduleprxcf.pdfIn PDF document text
    • http://getbuiss.online/314912679690eqvv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xokutamewa.rf.gd/annals_of_physics_latex_template.pdfIn PDF document text
    • http://rusuxagek.rf.gd/46264212149.pdfIn PDF document text
    • http://judilawazawu.epizy.com/xobujelewu.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/catanzaro_informa_notizie_di_ieri.pdfIn PDF document text
    • http://jibitolokadidus.rf.gd/vejeno.pdfIn PDF document text
    • http://viwukapatajomi.rf.gd/how_do_you_connect_rocketfish_to_tv.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_off00012c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C45 5220 bytes
SHA-256: 89264e6603801ea604fd4d7e9ea835fde3710ffbc436841caddcbc0a6b3d7dc6
font_01_sfnt_off00013dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFB 11728 bytes
SHA-256: 85d83b467e6d81523d9fe3d2515b903e098fe06a045bbed5c1a7319f26295ddf

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