Malicious PDF — malware analysis report

Static analysis result for SHA-256 48eab90c3c90142b…

MALICIOUS

PDF

75.2 KB Created: 2021-05-29 04:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a48754a81f27db2cd532a3c47fa69b2e SHA-1: e320ebda9fb40e5c53c08864645c1af7a50b8780 SHA-256: 48eab90c3c90142bdbfe1cfa3b290b41ab4178fbf70551910540a252f229a888
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'Achieve 3000 level set test answers'. No scripts were extracted, but the presence of external URIs and the malicious verdict strongly indicate a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/123?utm_term=achieve+3000+level+set+test+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404124/normal_5fd15cbe6891f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_603d3110b86ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499299/normal_5fe4dc9b6eda6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473064/normal_6032f740ed3eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402956/normal_5fe464c8318c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459164/normal_5fc68ad5699cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368504/normal_6047802f757d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407784/normal_601d3d89ef346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_60400b7aacf50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_601a2d805397d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374533/normal_5fe454e8a52d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370059/normal_6016c714da0a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387814/normal_6021aa78bf939.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368468/normal_5ffa8e3502d77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422368/normal_604cf08c755b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_6039630957dcb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7c90ee0-bd92-4176-9bb4-3b4059213434/5771650671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d511fd9-f98e-4709-9339-af2ab7d928d1/shiva_samhita_kaivalyadhama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae65561e-fed0-4b63-aefd-71034e411d22/cv_format_in_ms_word_2017_free_download_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/422c8f1d-2315-4c54-b527-0dc5702cfe9c/28594350472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76f878f-180b-4aec-ab36-ac051f562850/kolezorizajeserow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb51cce9-bbf1-40a8-b106-2c971f1c6bda/modo_de_produccion_feudal_y_sus_caracteristicas.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_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 5336 bytes
SHA-256: d9b0ddad5a00ce5120963b4c88f19950fe491c4c253365e9efa82da45cad27e6
font_01_sfnt_off0000fa54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 10904 bytes
SHA-256: b8fc5ed8460a15485eee443bbe7ab5514b4eda77dc9b7338b3affffce36c8e0a

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