Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf6b0537e385c55…

MALICIOUS

PDF

72.2 KB Created: 2021-02-18 13:27:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 882325f9f1b045da8d8a243f540d87cc SHA-1: d6626f4c042171eca91da5f62a8ffa67e3f52f01 SHA-256: 5bf6b0537e385c5559d41bd3c347064f59ceab116f827dcc2ccae024c26b478e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though truncated, includes a URL that aligns with the observed malicious patterns.

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://druttle.ru/123?utm_term=if+i+ran+the+zoo+summary PDF link annotation
    • http://ver-alex.website/70862178752xkz8c.pdfIn PDF document text
    • http://faxagigotitij.66ghz.com/antivirus_for_pc_windows_7_filehippo.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/9305874.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/tpge2gf/remote_control_tv_pour_android_apk_uptodown.pdfIn PDF document text
    • http://sigifiketatoge.22web.org/projectile_motion_marble_lab_report.pdfIn PDF document text
    • http://lesanuzununefa.22web.org/todij.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/hLhgjjh/19355520470.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xovipofeguz.epizy.com/jusolesokodum.pdfIn PDF document text
    • http://mokisomalew.rf.gd/cute_baby_goat_images.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/what_does_it_mean_when_the_sun_is_shining_and_its_raining.pdfIn PDF document text
    • http://fetevatakipip.epizy.com/biology_lab_safety_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/xoluniduwoxe.pdfIn PDF document text
    • http://koxogulu.rf.gd/bizobarerudesuzoxasigu.pdfIn PDF document text
    • http://sudemididesiz.epizy.com/kijatotefuk.pdfIn PDF document text
    • http://sumojoripira.rf.gd/30478038093.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/10234258304.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/megamifubuxijefa.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_off0000dd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4C 5064 bytes
SHA-256: 38ed5d213b83e9845f2f3c572240120a996a678541877db86c88e8d078deef8e
font_01_sfnt_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 11044 bytes
SHA-256: a1204b55c409e8a78c7c025b08276ce15943d7c9cc0644d8934785d478965a4c

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