Malicious PDF — malware analysis report

Static analysis result for SHA-256 4855dc746a2f55b9…

MALICIOUS

PDF

69.2 KB Created: 2021-03-31 07:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d8a9de0eb547743d177553a1c74c880a SHA-1: fb9909e2b2b7386b0bee2b5b501be1c87910aa4f SHA-256: 4855dc746a2f55b9bb15e831bd38405354413d03d1bba24690158a9e9f93c917
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of external URIs and a link farm suggests an attempt to direct users to potentially malicious content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/wix?keyword=bioshock+rapture+libro+pdf PDF link annotation
    • http://kopuvimu.scienceontheweb.net/49105731576.pdfIn PDF document text
    • https://cdn.sqhk.co/xozifejor/fslThbl/57273610548.pdfIn PDF document text
    • http://kovativegapok.getenjoyment.net/aramco_ipo.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/Ihdgeja/super_mario_bros_deluxe_gameboy_color_cheat_codes.pdfIn PDF document text
    • http://fegiroxopirez.sportsontheweb.net/95989587647.pdfIn PDF document text
    • http://tulutita.sportsontheweb.net/61394200423.pdfIn PDF document text
    • https://cdn.sqhk.co/lepowabog/fjgDiif/tamil_hd_movies_2019_free_download_in_tamilrockers.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/8ksCpia/vowabonikapijevoluv.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/g1jhvib/56019936739.pdfIn PDF document text
    • https://cdn.sqhk.co/nisosawero/hhja1jb/acknowledgement_letter_for_receiving_documents_template.pdfIn PDF document text
    • https://cdn.sqhk.co/sowodopevew/bhbghjf/dungeon_quest_cosmetics.pdfIn PDF document text
    • http://virujurarajilef.getenjoyment.net/canada_visitor_visa_form.pdfIn PDF document text
    • http://kugaraginoja.mypressonline.com/kadovugewemumur.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/cUOLhe0/nilozawigeru.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/tetenifeme/dadudavugebemotul.pdfIn PDF document text
    • https://d920bd67-dfaf-4c99-85b0-fcb8118dfb91.filesusr.com/ugd/383849_d3e608b18bc34b64a2fa668803cb9411.pdf?index=trueIn PDF document text
    • http://vavadot.onlinewebshop.net/what_is_margin_of_safety_in_stocks.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/fisiopatologia_del_absceso_hepatico_amebiano.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/what_is_the_purpose_of_an_assembly_drawing.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_03a991ad406c442fb0ba44cd61b2421a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/save_twitter_video_gif_apk.pdfIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_f25ac3a9f0a946b69c1cf8833a350637.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedexim/el_lazarillo_de_tormes_tratado_3_personajes.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/99996336637.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_off0000ce02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE02 5496 bytes
SHA-256: 35cbf6d740005c95437debba595e411f438f420566c05e7ec87dc69cef661ea1
font_01_sfnt_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 11412 bytes
SHA-256: b7a2d460860bb3f6b18adac6b6caf63e6bd8de14fb8fa74f848ae4f25816c984