Malicious PDF — malware analysis report

Static analysis result for SHA-256 f704c9dfea3b4d07…

MALICIOUS

PDF

70.9 KB Created: 2021-02-12 02:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e17cbb5987e47814f96e2bb8cb79732e SHA-1: d6a504ee80e51160459603fa6ecfe775b5ea52aa SHA-256: f704c9dfea3b4d0716382044fffd90239d6d34a7da847af60d9c3224eb98da71
96 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to potentially malicious sites, masquerading as educational content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest it's designed to trick users into visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=olympic+math+worksheets+free PDF link annotation
    • https://cdn.sqhk.co/fadanade/jaigxhj/61303115544.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/qjeghjf/pitadogodujobaduvaka.pdfIn PDF document text
    • https://cdn.sqhk.co/soredepel/jM6gfie/draw_a_stickman_epic_3_pro_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403408/normal_5fcf4dc938e33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372702/normal_6009a59cbfec3.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/fgdA1gg/wixebimi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417429/normal_5fc69f807802f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_601055fb5a677.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/NhbGVG1/94868232097.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kejefutipetube.epizy.com/volcanoes_earth_shattering_news_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/vowebarutisifokojuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/kekobitodojukagunokadeb.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/39193909159.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/gift_money_letter_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/61648621007.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_off0000d80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80F 5540 bytes
SHA-256: 0bd760dd1343ff4284d34e34afe85a451d758be26b168855ab6974a1236ec4d8
font_01_sfnt_off0000eace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 10472 bytes
SHA-256: d32cf0d5d2a076c77061c1026a177ffdaf8df75c8e893f79808a9a45e96dac68

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