Malicious PDF — malware analysis report

Static analysis result for SHA-256 684737d247b5917b…

MALICIOUS

PDF

78.6 KB Created: 2020-12-28 18:14:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0b690cd1f435f78432162782def7401a SHA-1: edd525301b740849af7366e5620fbf927dd8f349 SHA-256: 684737d247b5917b56f7d52d7c1910f64ccfb7708bb2e26c6ece304c95bdff25
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, with one prominent link pointing to 'traffnew.ru'. This suggests a phishing or malware distribution attempt, masquerading as project documentation. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common phishing lure.

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://traffnew.ru/strik?utm_term=school+management+system+project+documentation PDF link annotation
    • https://lavidibiw.weebly.com/uploads/1/3/4/5/134582964/1f9448383370b.pdfIn PDF document text
    • https://mizunilido.weebly.com/uploads/1/3/4/3/134352057/7641019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5f988afec35bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_5fb458787fb31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_5fd9c9c459a94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403819/normal_5fd2218def97f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383924/normal_5fe9132151f35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_5fa180ac1977d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_5fa3969b08812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476443/normal_5faaa32bd04b8.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/venunamazozuzo/sample_kindergarten_guided_reading_lesson_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/muvunekagok/purium_flex_foods_list.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/metric_conversions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/management_reporter_process_service_stopped.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/7613698569.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/msa_altair_4xr_datasheet.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_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 5768 bytes
SHA-256: 376fae9d09eb832cf6f060e9617ab7ecd4e3c6779b9de326d22aa09eb2322e3a
font_01_sfnt_off00010aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 9984 bytes
SHA-256: da52a4a5b75d2d7e1c34e349ca372659086d169f55febddaff361217dc8140b2

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