Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d13b593160580ba…

MALICIOUS

PDF

67.9 KB Created: 2021-03-03 03:20:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 58c30615afdbb999b6ab54fee96dfa10 SHA-1: 11922c27f55a3ceb5d4df03232a997d360b07e76 SHA-256: 3d13b593160580ba16247611ea00f5860d914baa643e34d4c701c467c7a8bb55
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains embedded URLs that lead to suspicious domains, likely for distributing malware or phishing content. The document body, though heavily obfuscated, suggests a lure related to 'Algebra Nation answer key', aligning with social engineering tactics.

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://midufefew.ru/123?utm_term=algebra+nation+answer+key+section+3+topic+1 PDF link annotation
    • http://demask.fun/62974780905npqox.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/yfXtnge/elliptical_spiral_galaxy_shape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_6035764d909e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465538/normal_5fdb22745b5ec.pdfIn PDF document text
    • https://cdn.sqhk.co/pananele/gh7noje/kenixolupoz.pdfIn PDF document text
    • http://gordei2d.com/16371934437ta4mc.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/a39elgd/resazev.pdfIn PDF document text
    • https://cdn.sqhk.co/mudifuto/Wgcsto4/hyperspace_beck_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451574/normal_603e37c5cf2eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_5fda3cfea171e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406456/normal_5fda6f7dd1346.pdfIn PDF document text
    • http://ayazshabutdinov.club/ms_project_for_mac_trialuwhbq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414677/normal_5fc6b535f1fd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413118/normal_5fcd6339d75a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://safedoguno.onlinewebshop.net/57227747168.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/2174587454.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_off0000c849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC849 5704 bytes
SHA-256: dc9a17b2bd9b6d5dc2c76f2e6ed61881919e966c3eb27f75d37d57bba3375aec
font_01_sfnt_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 10852 bytes
SHA-256: 5d975bfb9e14e2a80c429ac037fa8c71cb714d275afb74a1a421b92135761bf1

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