Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefb0ffd35e33ee5…

MALICIOUS

PDF

76.9 KB Created: 2021-05-22 03:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 129ca7512908d74ab5042ab2ca41d92b SHA-1: ce9975b77afbe3440507b1c1b4038f4e0d66caaa SHA-256: fefb0ffd35e33ee57442f6aa30e37ac6ca06170434d885d9cab022073fb39aae
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URI pointing to a URL that offers a free download of a legal textbook, which is a common lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to trick the user into downloading a payload.

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://druttle.ru/strik?utm_term=goodman+and+gilman+12th+edition+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405652/normal_605b8d38c90a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489586/normal_6025e6fe8a52a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476756/normal_5fdba6094f1c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424378/normal_602d99d07ec02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_6050ee20522d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_606b99ef3af1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415046/normal_60000d32eb206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454995/normal_5feaf18c07c80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426688/normal_600f22ff4df48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366044/normal_5fc7cfd48e52e.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/f4d49420-0277-444f-ac22-f127e76c8abc/libipiziwelijeduwul.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/sublease_agreement_format_in_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66657689-5083-4f87-9f0e-f7a247bb00e7/how_to_fix_a_broken_portable_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2fd913c-be96-40ed-a99b-e1242892733f/sodijojiz.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/dialogue_worksheets_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/vugetevojabitepepibe.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/l_amlioration_continue.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/al_quran_mp3_app_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/959d1721-78c9-465e-93a7-56c1ace83c83/what_is_the_best_8_quart_crock_pot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb739a10-1082-4472-a179-53b7b889e19a/jofasinarabuzoxebalafix.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_off0000ee01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 5584 bytes
SHA-256: 1cd77597e82dd520132cd704fe1731218ed1186754a90c404c051c5e42a1e177
font_01_sfnt_off000100ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EC 11052 bytes
SHA-256: 3b46d9c65edb47f6c140bb702feff957fbfd25167900307853ff7ed2cd0b5af5

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