Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea2c4deb956f007f…

MALICIOUS

PDF

72.3 KB Created: 2021-05-06 21:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1d3eec3b85cb6f75f3f134a96dc752e0 SHA-1: 23fb19b032f463cba02f1cf971675aaed7463315 SHA-256: ea2c4deb956f007f347f951d6348193ac45a346a6b4433e4a5fc8943dd972e9e
134 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, indicating the document's purpose is to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/strik?utm_term=pre+calc+textbook+7th+edition+pdf PDF link annotation
    • http://wirobigi.medianewsonline.com/acca_f9_revision_kit_2020.pdfIn PDF document text
    • http://geleostone.online/roblox_dinosaur_simulator_best_water_dinoo9xdn.pdfIn PDF document text
    • http://esagafow.fun/zulatogiwemekosavosaikvdh.pdfIn PDF document text
    • http://meetchambre.xyz/sakibo3wueu.pdfIn PDF document text
    • http://indonesia2health.online/resumen_del_libro_las_flores_del_maldh8ri.pdfIn PDF document text
    • http://mavpa.fun/90900515352wj374.pdfIn PDF document text
    • http://izzzaaa.space/wevavolum51vk.pdfIn PDF document text
    • http://pixell.store/kukebemopodojuwud4b4ce.pdfIn PDF document text
    • http://storedubai.shop/html_maintenance_page_template_freemgz7r.pdfIn PDF document text
    • http://leree6.club/risese5icww.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/fuwadilemiverevajunubo9y8yg.pdfIn PDF document text
    • http://logvoz.ru/defofibasowomcv0a.pdfIn PDF document text
    • http://future-techno.ru/rae_es_diccionario_panhispanico_de_dudas_appendices_abreviaturashdfbp.pdfIn PDF document text
    • http://sportita.fun/macos_catalina_beta_installersdrpx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lodumojokexiku.onlinewebshop.net/apprendre_l_anglais_rapidement_et_facilement.pdfIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_0670dec796e74280934ded087ef40c4c.pdf?index=trueIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_a24952f993d046a1bd5dbf0b5994d672.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/intellicharger_new_i2_user_manual.pdfIn PDF document text
    • http://nizowozutagele.atwebpages.com/40612647251.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/diferencias_entre_anorexia_y_bulimia.pdfIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_b3447035dfd341ea86375114761c846e.pdf?index=trueIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_fc91fc45ef154fa99652da732654bc9a.pdf?index=trueIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_9a8e99bf0b1649c2b0eb7fe9d960cee2.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F6 5420 bytes
SHA-256: 2628dcec63966efe6c0c4cb8a08e134b72bc68b4962820cfa45256a2bb86838e
font_01_sfnt_off0000e75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 10292 bytes
SHA-256: 827a608ddc29dae6f0638d3f31ec63fb55ac022a10961462c3c4058a7a3b4173