Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a83970b873c2955…

MALICIOUS

PDF

62.1 KB Created: 2021-02-15 19:01:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: eaf61b9b227dd0ed08016e58d024cdd1 SHA-1: 5f8e9d1215106893e35289b8c4969b1141092a61 SHA-256: 4a83970b873c2955cabf4b05176329971ff9ce134de980a4638e26643b173f80
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, containing numerous embedded URLs pointing to disposable hosting and link farms. The document body, though heavily obfuscated, appears to be a lure related to 'climate change', suggesting a phishing or malware distribution attempt. The presence of external URIs and the nature of the heuristics indicate the file's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=4+effects+of+climate+change+bbc+bitesize PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375522/normal_5fe7fffa16253.pdfIn PDF document text
    • http://vokegitejupud.iblogger.org/happy_birthday_wishes_songs_tamil_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikebepo/Mg1he8G/eye_doctor_hospital_game.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/idia0hi/age_of_empires_2_campaigns_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366959/normal_5fc9b361299df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464083/normal_6002ecdc6b9bd.pdfIn PDF document text
    • https://cdn.sqhk.co/duputokodoz/hjhiig9/59004487053.pdfIn PDF document text
    • http://romabeveseruzor.22web.org/reference_sheet_name_in_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/XINUiiP/mansion_blast_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530712/normal_5ff24e18a503e.pdfIn PDF document text
    • https://cdn.sqhk.co/datujisukebe/fwfgfWh/wawajato.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fopaguduvogo.rf.gd/15688575137.pdfIn PDF document text
    • http://warunegiluj.rf.gd/14291844063.pdfIn PDF document text
    • http://jufosuliz.epizy.com/sikatarufukimawopilip.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/fur_elise_piano_piece.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_off0000b935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB935 5384 bytes
SHA-256: 47f49a508dd4b2148ab570147524fb5a4b7778c5e1288dc3fda2ac868ea230d2
font_01_sfnt_off0000cb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6E 9500 bytes
SHA-256: db2e8d31eadebfb2fc036251dff2a5f96a47b334e6d384b9c44e221f2bfe64f8

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