Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4dbe1703f6ca6d…

MALICIOUS

PDF

81.0 KB Created: 2021-06-04 14:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6df1313601fbe9da1f1b54d0edc6e249 SHA-1: 2167af7f950acc8e88a809b595e0542466d0a8ba SHA-256: 0a4dbe1703f6ca6d288b3d2472e2c04d00e0d62dd5f47b4fce4aebb0d7f510a5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The primary malicious URL, https://inwebjor.ru/pbw?utm_term=planeacion+lainitas+segundo+grado+2020, is likely used to redirect the user to a phishing or malware distribution site. The document's structure and numerous links suggest it functions as a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://inwebjor.ru/pbw?utm_term=planeacion+lainitas+segundo+grado+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470833/normal_6009e4399ecd7.pdfIn PDF document text
    • https://talokawibameze.weebly.com/uploads/1/3/4/0/134000376/1330282.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444351/normal_5ff8ad68d0a78.pdfIn PDF document text
    • https://zemibojonu.weebly.com/uploads/1/3/5/3/135324970/9595275.pdfIn PDF document text
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/gemepag_nasapabav.pdfIn PDF document text
    • https://pimelotug.weebly.com/uploads/1/3/4/5/134576353/6a3a4837c99.pdfIn PDF document text
    • https://babosaka.weebly.com/uploads/1/3/1/3/131379498/dcd66c08cd9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jebusolole.pbworks.com/f/suxepijububikofetafeku.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/f/bully_mod_apk_data_high_compress.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144436683/vutesibozarexokewoz.pdfIn PDF document text
    • http://dowiginade.pbworks.com/w/file/fetch/144577356/tarihin_shehu_usman_dan_fodio_da_hausa.pdfIn PDF document text
    • http://fixiguru.pbworks.com/w/file/fetch/144565293/soul_knight_secret_button.pdfIn PDF document text
    • http://kefimazusob.pbworks.com/f/79334122390.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/w/file/fetch/144413721/majaguvusobobaxuxu.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/w/file/fetch/144424299/how_to_clean_arctic_king_air_conditioner_filter.pdfIn PDF document text
    • http://furalagaposu.pbworks.com/w/file/fetch/144551751/how_many_calories_in_a_medium_iced_caramel_latte_with_skim_milk_from_dunkin_donuts.pdfIn PDF document text
    • http://jeselivid.pbworks.com/f/trigonometry_by_lial_11th_edition_free.pdfIn PDF document text
    • http://luwivaj.pbworks.com/w/file/fetch/144517719/15105691252.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144421653/verbs_followed_by_ing_form_or_infinitive_exercise.pdfIn PDF document text
    • http://kakewizajupe.pbworks.com/w/file/fetch/144598104/mapewanox.pdfIn PDF document text
    • http://pefumugat.pbworks.com/w/file/fetch/144542736/how_to_use_toshiba_tv_remote_control.pdfIn PDF document text
    • http://wenitudodub.pbworks.com/w/file/fetch/144552504/32349057651.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF72 6744 bytes
SHA-256: 8187145963fbf8e0b7977f93bb9cbfc296fb812f6e2b6f40a3c8d31ca5a797a4
font_01_sfnt_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 5380 bytes
SHA-256: 49a1a3a628c0f521e52388c01b00e2f265dced76aa9984762ffc1b0bbfe247db
font_02_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 3228 bytes
SHA-256: 2eaf3b6068a80977f7ac6d3da6efe38c19b53289789a4f291241230f84f1645c
font_03_sfnt_off00010fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAC 10928 bytes
SHA-256: 349855d66189c6b72107b4813d8717f1373047c22bd1848b24e9d74490cfd5ac