Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa557170364b7159…

MALICIOUS

PDF

73.8 KB Created: 2020-11-09 21:13:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 83af253adc949782d92b8bbcf3049b36 SHA-1: 6c8c17de02746adb4ce14e7411cd85b8750f43f5 SHA-256: aa557170364b7159f6224b0cd8217c35691b8b3deade8cf741b78b3669e2487a
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffe.ru/123?keyword=unlock+application+samsung PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5f9018bd61da2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_5f8df687a555f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385863/normal_5f8e1bdfbaf50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427080/normal_5f9e14c40387f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379237/normal_5fa8af9d26630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389570/normal_5f923f56a480c.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/879669ab-d8a2-4256-bd10-30cc1559666b/2181041948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44212a6c-1d8f-41e4-b9c1-c4dfafcf22f0/26403664317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddfee868-532a-4eb0-afa2-898166ff69b4/dosixifomafadagaluxajes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c291130-fea2-488a-983d-69eb819ea5ee/kivelipizusupifig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/525c5000-e738-4dc3-8cb3-80ed85468500/kimopevezetemap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7876ad44-06da-4947-a937-32b23ce0537c/lista_sentimientos_positivos_y_negativos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9efd0a3-bbd6-4364-a749-5d5a8ccf599d/actividades_desarrollo_personal_y_social_preescolar.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF0 5212 bytes
SHA-256: aef8062e2ee2814ea1c66dbb962c97368f3e6986bc1191148b4c7626dc607596
font_01_sfnt_off0000dfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA9 10896 bytes
SHA-256: ee8bd0b5251f04bf57d5793cf46a66c23cdfc0365b231a6cdb22ae6f0197fa2a
font_02_sfnt_off000104e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E7 16204 bytes
SHA-256: eff505afb8e26c38bee6bcfe2a1fe7ec06ef672c1b18ea48f40a557974472291

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