Malicious PDF — malware analysis report

Static analysis result for SHA-256 71edecfa28fb8f46…

MALICIOUS

PDF

77.1 KB Created: 2021-03-21 06:30:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 345c3eb056446b100ba08b06845523b6 SHA-1: ca24ae16c5be9952b7bf96d06b30430847f4cc46 SHA-256: 71edecfa28fb8f467f18ba647dff8ba3578efb75a5300c8094563667f641605b
184 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of malicious links is sufficient evidence for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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/award?keyword=alfredo+bosi+reflex%25C3%25B5es+sobre+a+arte+pdf In PDF document text
    • http://digitalmicroteter.xyz/sejarah_perkembangan_agama_islam_di_indonesialowc8.pdfIn PDF document text
    • http://duvejajenivogik.getenjoyment.net/jofebotevupatutili.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/baziderapaw.pdfIn PDF document text
    • http://peluxuba.sportsontheweb.net/linear_inequalities_word_problems.pdfIn PDF document text
    • http://bupro.asia/p_cad_librarykw0h6.pdfIn PDF document text
    • http://mastericy-chistoty.ru/437005950275zel2.pdfIn PDF document text
    • http://rorureferujuraf.22web.org/samsung_galaxy_tab_s5_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/jO4jEhd/ultimate_guitar_chords_and_tabs_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/ihigQhb/c64_emulator_download_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/govonesed/ggihids/xelufikakovopudagen.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/hguhiia/minecraft_egg_wars_server_ip_cubecraft.pdfIn PDF document text
    • http://sewakasatixori.medianewsonline.com/winidinukunixijibedov.pdfIn PDF document text
    • http://norasuzajo.mywebcommunity.org/service_of_non_alcoholic_beverages.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/monitorear_red_wifi_windows_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niselasot.atwebpages.com/pacate_candide_download.pdfIn PDF document text
    • http://tofalit.myartsonline.com/87403867713.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_3f703d2799a44424863a5e4ac0e3c224.pdf?index=trueIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_431651e6ec944cdb83b3a9af19b28d53.pdf?index=trueIn PDF document text
    • http://jarebavax.epizy.com/27369379475.pdfIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/86393333566.pdfIn PDF document text
    • http://fefekug.rf.gd/generos_periodisticos_de_opinion_e_informativos.pdfIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_eec7040fbf814325b96f7c46e6d1bf0f.pdf?index=trueIn PDF document text
    • http://fuluwaf.rf.gd/33496197556.pdfIn PDF document text
    • https://e79dab91-b8ca-4f03-a7cf-74564eaa1d8a.filesusr.com/ugd/009cd4_1a78dc6eddb04b29b15e646e5c12bc34.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_5805bdae475142a8be84750555f641c7.pdf?index=trueIn PDF document text
    • http://tiwatimab.atwebpages.com/vimixoxomovebatun.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_off0000ec3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 5452 bytes
SHA-256: 6a896bc9f13f66a33eacacd058efe5790004098fb949adbcb28dca986beb77b3
font_01_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 12424 bytes
SHA-256: 11f6710389315f50af19c20bb38fcfc4d24f123fa9ccab2c24ef4c74a5868f52