Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe4fe4df8a5a639…

MALICIOUS

PDF

86.4 KB Created: 2021-03-25 13:25:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: cd86d3f0343f33b2a8c845ee75376bfc SHA-1: 001d74360e07bf990ce8cb5681c3430cafb729d5 SHA-256: cbe4fe4df8a5a6396fc5d761a3d259962776fb08f9d8a84c0afca2844e5513b9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=cessna+150+flight+simulator+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499282/normal_60174796d3794.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379726/normal_5ff0c8965c630.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/hgjgjie/20788291748.pdfIn PDF document text
    • http://timurberg.ru/el_alquimista_paulo_coelho_libro_completoahjj9.pdfIn PDF document text
    • http://lollipopa.online/pet_sematary_2019_ending16slh.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/jgijboR/51821434777.pdfIn PDF document text
    • http://a-trvl.ru/230618549115jpso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_6049a5b3a1108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_600e11631f370.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/river_flows_in_you_guitar_tab_gp5.pdfIn PDF document text
    • https://cdn.sqhk.co/kibedutej/je5jgjc/19500097155.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369324/normal_5fcaa5dcd58f7.pdfIn PDF document text
    • http://daddytestit.xyz/puppy_dog_pals_lyricslglz7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452373/normal_603f60a658e5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_604f2ee03f112.pdfIn PDF document text
    • http://saroforati.medianewsonline.com/nafuvibovajikasevadada.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/wheel_of_life.pdfIn PDF document text
    • http://kazerurido.iblogger.org/the_hunger_games_2013_in_hindi_download_filmyzilla.pdfIn PDF document text
    • http://musofiron.ru/xoxeketomekerexisonarjaxlo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wepuwuzuvam.epizy.com/game_center_iphone_to_android.pdfIn PDF document text
    • http://posazexemonepen.rf.gd/cambridge_primary_mathematics_challenge_1.pdfIn PDF document text
    • http://jemileti.atwebpages.com/next_century_mathematics_basic_calculus.pdfIn PDF document text
    • http://rijejonusax.rf.gd/97103666772.pdfIn PDF document text
    • http://gobavaduxa.epizy.com/18730474736.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_off0001112c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112C 5404 bytes
SHA-256: 5dfb2a3722354dcefe8175916b936349772a156c4aa1cdad2bc4f39c1c2aaaaf
font_01_sfnt_off00012368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12368 11840 bytes
SHA-256: 5dc2f38c04410214cfc327550965926c5a5456a7fba8d482b7922bb3c0c9ee2f

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