Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d12502df3e98db…

MALICIOUS

PDF

74.6 KB Created: 2021-02-25 08:57:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 594a8f4c75fa9945c8719edc54c3b3ad SHA-1: f654495a3c4dda678725b1f3acd315e1047e7453 SHA-256: 87d12502df3e98dbfed28ada72db6fa8541fd3f6683172a4c51f0a4e2ac79ae6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating that at least one link points to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its intended lure, but the presence of many links and the malicious redirector strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=yaesu+vx+170 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_5fd7f78e0e971.pdfIn PDF document text
    • http://nemeloru.66ghz.com/10068914484.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/jdtJrW0/csr_racing_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/Mggz8jf/golf_impact_bag_reviews.pdfIn PDF document text
    • http://gonaxepafa.iblogger.org/53192889267.pdfIn PDF document text
    • http://bumalutaf.iblogger.org/international_law_master_degree_in_germany.pdfIn PDF document text
    • http://8bitbeardsco.com/76344992895g7i4b.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/heihjfg/53375753061.pdfIn PDF document text
    • http://tehnopolis.org/regevxqs54.pdfIn PDF document text
    • http://bu-markett.com/geografia_e_historia_1_eso_material_fotocopiablebnx1u.pdfIn PDF document text
    • http://vasezasu.22web.org/feedback_form_for_parents_workshop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/chomsky_normal_form_in_toc.pdfIn PDF document text
    • http://tukozadagafewan.rf.gd/abcd2_score_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/causes_of_world_war_1_worksheet.pdfIn PDF document text
    • http://vasenatisa.epizy.com/gmail_settings_android_email.pdfIn PDF document text
    • http://mujunuge.rf.gd/91553073204.pdfIn PDF document text
    • http://deroxemonak.epizy.com/conjunction_practice_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/21441130654.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/86956215944.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_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 4912 bytes
SHA-256: 93d8dc06ba67175abc180ad0b1430b8f4e3cc279e445b2caef1c7afa5e5213dc
font_01_sfnt_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 12632 bytes
SHA-256: 1241d61a803230e16cbd5d7a0d31fffc8810a77d0c649aa4ad8471cd3eb0545b

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