Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde548e55463b0a8…

MALICIOUS

PDF

74.7 KB Created: 2021-03-02 08:30:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b3ba2b5977606eaeddc972af323cafb9 SHA-1: 8f0cf9fde045428ba8c4bdb344717bac8ac5585f SHA-256: dde548e55463b0a8e3b6f386e31798c8aee3d75c25ea18f6c614df60282a698b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

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://nipisod.ru/strik?utm_term=what+were+punishments+in+medieval+times PDF link annotation
    • http://suzamajotibe.mywebcommunity.org/risk_benefit_assessment_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_603181bc245a0.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/mobil.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/thus_spoke_zarathustra_review.pdfIn PDF document text
    • http://gratoramaa.space/kuluxopiwusulisenafubovuxxpkd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474218/normal_5fe8177d46980.pdfIn PDF document text
    • http://vezerfa.xyz/equivalent_fractions_worksheet_grade_4qjvi6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480889/normal_60045c3a2e31a.pdfIn PDF document text
    • http://itayoga.space/fool_for_you_snoh_aalegrakqhvm.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/xoxulixuvez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_60192f638ceaa.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/lijurezovalunipej.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/demisuvolowaje.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/house_on_mango_street_quotes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486034/normal_5fe2e6734cea4.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/rurosaveruk/96150171818.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/impossible_quiz_2_answers_14.pdfIn PDF document text
    • http://tivakifuzir.atwebpages.com/amoeba_sisters_video_recap_enzymes_answer_key_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/wuzokoxifegagifekofusa.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_off0000e91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 5364 bytes
SHA-256: c6b52328cb26a1fbe284f164919999f6579ce9066563cf6c69831064d11e1238
font_01_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 9952 bytes
SHA-256: 759846691d2c46bf796879a4fbb504fc42af9a3bd96885ba215cb421a0e32ece

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