Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a4cdd6b30538d2…

MALICIOUS

PDF

73.2 KB Created: 2021-06-11 12:39:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 67f1a2f57f7d9e4fcb2c0c1790a8a4c9 SHA-1: 90443b97b983d3e54bab429a8cdc7bcad4a931fb SHA-256: d3a4cdd6b30538d2570afd9af8750d657a3487418c38357bb5d6a409bd151ddc
96 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 embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://philabc.ru/pbw?utm_term=reading+exercises+for+b1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455914/normal_605f80c351b05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447460/normal_604fe9c86dc99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455914/normal_6003f7cecf4a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_6062c0640389a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_6056015369348.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424405/normal_5ff37e0cd3ff8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375088/normal_5fc7b1aa83aba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446034/normal_6044f8469bd82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465264/normal_60080eb93bd07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413011/normal_602199407c020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_6033bbbe413cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426413/normal_602681eaab7de.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/81adcc27-4b1a-48df-8c73-294f08ba6187/nimefediz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e464b90-886b-4d7a-81a7-223df9fc4774/whatever_happened_to_diane_schulers_husband.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d2bb92-fffb-467f-b2a3-29d1ec66139a/58966852272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2089c17-3273-44d6-9a2f-657ec40419da/mojukijugisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42d7a53b-a535-44ee-a3d2-df307e5b80dc/literature_review_on_the_theories_of_attachment_and_bonding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/993bd876-7f72-407e-83bc-ae9d1a12a620/19388791191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4451817a-69da-432f-937d-2243e4e72019/gevuburemedibitizivoxej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b81786-66ae-45b6-a5a1-9173baf33dab/descargar_biblia_de_estudio_thompson_gratis_en_espaol.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_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 5424 bytes
SHA-256: 820b921747872de877f67cf922043873d6ebd01cf94eb1e4e8390db4d771e8bc
font_01_sfnt_off0000f2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 10988 bytes
SHA-256: 8961b80f7a876e564565d4d28607925389cede6f7314d90e1b2613de34662c92

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