Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c58b1588fa5cb3c…

MALICIOUS

PDF

76.5 KB Created: 2021-03-13 14:20:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fca188d8f0696cacabebb10204655cb0 SHA-1: 1fa98199299efbcd92b24e2053c6ba30c2aea2b9 SHA-256: 9c58b1588fa5cb3cf0e2bd5c87e63737b596041371612b9da722c4dc84a7e254
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL leading to a suspicious domain that is flagged as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

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
  • 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://resalured.ru/strik?utm_term=the+life+cycle+of+mosses+and+ferns
    • http://yarrebitteh.online/rutawewo7jju6.pdf
    • http://varistop.site/30919388509gk8h0.pdf
    • https://cdn.sqhk.co/bexoninodag/idAQig3/vocal_folds_arytenoid_cartilage.pdf
    • http://summ-green.fun/matekazararodwiwi.pdf
    • http://greatmasters.biz/xebasodekamidebimebinoruopxqb.pdf
    • https://cdn.sqhk.co/vasegodesazu/jdbHgik/26940140994.pdf
    • http://specrazreshenie.com/12401613947is7if.pdf
    • http://nukels.xyz/learn_python_for_data_analysis_freexpd6g.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/memexelu/adjective_worksheet_with_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/b594f335-dcd8-4eca-a77b-6c5be9eb292e/honda_hrc216_lawn_mower_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/1ad3a7a0-f0da-42da-af44-2a003f66eb76/whats_another_word_for_ethics.pdf
    • https://uploads.strikinglycdn.com/files/bc00857d-9214-478e-b683-61c617aeb7e9/the_makers_diet_by_jordan_rubin.pdf
    • https://s3.amazonaws.com/vavapekadoliti/how_do_i_calculate_sprinkler_flow_rate.pdf
    • https://s3.amazonaws.com/xoferuzu/watunakufej.pdf
    • https://s3.amazonaws.com/zedilegol/43068495462.pdf
    • https://uploads.strikinglycdn.com/files/a27c491b-83c7-48e3-bb07-1cc40b6d25c6/70085644550.pdf
    • https://s3.amazonaws.com/mizeteb/15206634103.pdf
    • https://s3.amazonaws.com/pasawe/lobabofogoximimar.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed04.bin
6f2f80bac8cc13823587bd19ec2159f093bbb9bdc1a6f8b35832981e6b7998fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 5312 bytes
font_01_sfnt_off0000fef8.bin
f75b106cc22cadf2565598a7096da2a2d19279ab37e9e907962eb5b1598383f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 11136 bytes

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