Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8a4036bd1f3d58…

MALICIOUS

PDF

91.0 KB Created: 2021-03-13 21:20:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a33a6ff0178d73a737d1512382d35af3 SHA-1: e89339ea2c2e6b5290d7ee9e5c984169df0c5efb SHA-256: be8a4036bd1f3d58191ff40f56eca0c689a13e83dd4f0d9a26a4173911f65070
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=how+much+does+a+smartboard+cost PDF link annotation
    • http://walolexokesufa.sportsontheweb.net/applebee_s_carside_to_go_menu.pdfIn PDF document text
    • https://zixojubagever.weebly.com/uploads/1/3/4/6/134613499/vogiwakenudisa_fesuwe_melinagag.pdfIn PDF document text
    • https://diwifiburu.weebly.com/uploads/1/3/4/8/134871147/9862415.pdfIn PDF document text
    • https://dakesepev.weebly.com/uploads/1/3/4/3/134308776/rawida_punexuvase_lumudowowixefu_vazobo.pdfIn PDF document text
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/zipuliwonapeju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382643/normal_600f7ab73d344.pdfIn PDF document text
    • http://banepudota.iblogger.org/can_you_marry_multiple_wives_in_stardew_valley.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/vibumep.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/45089058405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476443/normal_601dca6c49adb.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/bidirectional_visitor_counter_using_arduino_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ab6503e-0dfd-4d34-8ada-3f5de337ab93/medical_spanish_study_abroad.pdfIn PDF document text
    • http://damaxokabipo.epizy.com/uniforme_chasseur_ardennais_1940.pdfIn PDF document text
    • http://dozopedatofol.atwebpages.com/centrifugation_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/mlive_mod_apk_chiaseapk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82f4dafd-d628-4a2e-b9f9-4b12cb7a7b16/37184686188.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/aristotle_poetics_in_hindi.pdfIn PDF document text
    • http://fokerek.epizy.com/87892050762.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/mofivazakabozewamaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/63898402495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a5118b-ace4-4bae-b88e-045a40d176dd/sequential_search_in_data_structure_java.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_off000126e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E1 5340 bytes
SHA-256: bf9e261ef32d466cfbabaeb72a13c0cd6c7486fe7de98ac6b272c1c2624063a1
font_01_sfnt_off000138ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EA 11020 bytes
SHA-256: abbf0585251d68649b1982d63e9fbbd883c7b91b4203441168c9d327c59bcc77

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