Malicious PDF — malware analysis report

Static analysis result for SHA-256 5311ac23a5137b7a…

MALICIOUS

PDF

108.6 KB Created: 2021-02-28 12:55:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0415a738f652423c1713845351d57b72 SHA-1: 20b8c1aa4b8b7ef5e965493b2a0250a6e4a2c911 SHA-256: 5311ac23a5137b7aec048a1d30c1dd3e3ef6d3da99f594a90df6b1af37e8635e
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URI pointing to a suspicious domain, likely intended to deliver a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to a computer assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/123?utm_term=introduction+to+computers+assessment
    • http://discout.online/vapivut501.pdf
    • https://cdn.sqhk.co/vipikunowi/km4iiid/59074812860.pdf
    • https://najuxobetejip.weebly.com/uploads/1/3/4/2/134265875/6696440.pdf
    • https://cdn.sqhk.co/dasofuduveje/Ziflggm/rally_car_racing_simulator_3d_download.pdf
    • http://job-finder.space/different_shades_of_period_bloodfzcvj.pdf
    • http://olymp-trade.top/agriculture_study_material_for_competitive_examsz4zg8.pdf
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/dibululewo_nalimapi_juvewe.pdf
    • http://wowitaly.pro/gikogibuxamock45.pdf
    • http://netewe5.xyz/linear_absorption_coefficient_equation791f5.pdf
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/vonidemorogigug.pdf
    • http://axecheat6.xyz/teach_english_online_jobs_from_homenaz6g.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kesofuleradazod.epizy.com/34045092688.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_off00016d87.bin
d7428e265070ea331ef8aab8e31648b3d1570ac6c4e194958ffc2b7da3998ee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D87 5124 bytes
font_01_sfnt_off00017ed7.bin
f07451b6a8dca4aec64ab68f98ab48dfda050de3acd22c8647d7d32689dc6fb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17ED7 11272 bytes

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