Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ebd60cfcae3c62…

MALICIOUS

PDF

105.5 KB Created: 2021-04-09 22:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 43cfab715b1c7281318ba80002b15a9a SHA-1: 2072a06ae65d68a1ffd61419e6ee09e3bbdd8f46 SHA-256: 10ebd60cfcae3c6231e1fe9093213124900f30861df6f26541d0c86a0f7dc832
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated, but the presence of redirector links suggests an attempt to lure the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=major+bodies+of+water+in+canada+map In PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/TuhjHJA/pirate_tales_battle_for_treasure_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/jjhjWgi/home_design_3d_for_pc_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_6058a0182fac4.pdfIn PDF document text
    • http://katalog-siberian-force.online/craftsman_planer_molder_bladesawr9i.pdfIn PDF document text
    • http://wusapibixabupak.iblogger.org/wopojuwux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475208/normal_6064a1425a8dd.pdfIn PDF document text
    • http://teachost.com/118597177058v4ym.pdfIn PDF document text
    • https://cdn.sqhk.co/bebumila/jF5hija/46181703046.pdfIn PDF document text
    • http://hookup666.site/2912907485605y71.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/idhaOgh/car_racing_helmets_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/qBPKidC/minivuvasedapapizo.pdfIn PDF document text
    • https://cdn.sqhk.co/rogokivika/HjfagfO/village_defence_idle_rpg_tower_defense_android.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/zihU8gg/fowebijasapejad.pdfIn PDF document text
    • http://my-favshope.online/wanott9mzn.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/azELPif/milowisuzimobebakexufuro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473359/normal_602ea0895f025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501208/normal_60309e8800e5b.pdfIn PDF document text
    • https://cdn.sqhk.co/gunakawujo/jYRhagg/good_questions_for_the_sausage_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xefujuji.rf.gd/40259297092.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/hoover_steam_cleaner_liquid.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/nudefafirojujudovomuden.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/check_string_date_format_javascript.pdfIn PDF document text
    • http://tezipibuboxigo.epizy.com/79900290673.pdfIn PDF document text
    • http://puwegobatove.epizy.com/basic_english_conversation_lessons.pdfIn PDF document text
    • http://ximagutetala.epizy.com/riwuduvifuvobogiwulajox.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_off00015d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D66 5580 bytes
SHA-256: d83be1532bd8b1fd04b87cebd5669d96a8cbde2481980df7d74a0e080b63273d
font_01_sfnt_off00017066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17066 11888 bytes
SHA-256: d1bd4f592b071ab29a06c939f36fa98fac8fcf94f344ae333b676ec1e4e925cc