Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7726c29af20f78…

MALICIOUS

PDF

72.5 KB Created: 2021-05-12 23:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e2dbfc5019394f565ac92296c9d81cb3 SHA-1: 56d05034621d69bc6038a34c9b129af5c7e6f079 SHA-256: 7c7726c29af20f78795fb9ab8465a2eb3e008170171a99bd2077b317dee0321d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or a distribution mechanism for further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to host or redirect to malicious payloads.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/strik?utm_term=anatomy+coloring+book+wynn+kapit+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375344/normal_60205540e6640.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/ecad07cc3.pdfIn PDF document text
    • https://povitopol.weebly.com/uploads/1/3/4/6/134648875/sidusakogutugi.pdfIn PDF document text
    • http://mipexalazalekab.getenjoyment.net/zujavitolesinifojax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_60617d234a6cc.pdfIn PDF document text
    • http://palaxofivuleduj.medianewsonline.com/7888777732.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/97671808442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8427af78-fb19-477f-8006-064a4e60fd07/freelance_writing_jobs_online_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/liber_divinorum_operum.pdfIn PDF document text
    • http://pasofotamuteper.atwebpages.com/26473975979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32982a20-45c0-4aa1-94cd-4679b6e0bd15/college_algebra_test_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/phases_of_the_moon_worksheet_grade_2.pdfIn PDF document text
    • http://masemipeba.myartsonline.com/jinetil.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/atomic_habits_james_clear.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/35037774277.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/the_aeneid_robert_fagles_audiobook.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_off0000de21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE21 5684 bytes
SHA-256: 4e5cc20a6b13370c34c3f7345e11595601cf6ff8547c10c39d65cb41c162c4a5
font_01_sfnt_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 10304 bytes
SHA-256: b86f00697b121bad0c45549f97e6dff30f2d4c90c0581a8c25ffa43b9f56b05c

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