Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c9913a13ece5e4…

MALICIOUS

PDF

73.2 KB Created: 2021-02-08 00:25:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f10557aa29a02c6dd9f567fd8b036bd6 SHA-1: ce5ce33a538fb37bf612a4979016b6ea5bf38295 SHA-256: d6c9913a13ece5e4f26e9cb6d13c20468ed19e388732115b4e2cdba74e095fa0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' containing 30 external PDF links. The primary URL, 'https://maypoin.ru/123?utm_term=fundamentals+of+nursing+test+questions', suggests a lure related to nursing test questions. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

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://maypoin.ru/123?utm_term=fundamentals+of+nursing+test+questions PDF link annotation
    • https://cdn.sqhk.co/jixuvepabu/wbQgcNi/black_christmas_card_images.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446492/normal_601d55ad70294.pdfIn PDF document text
    • https://sapesikunudob.weebly.com/uploads/1/3/1/3/131398489/kitojijuma-lapateraxapan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_600a9dc706ab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_60117d5f0a748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407747/normal_6018b65dcfcff.pdfIn PDF document text
    • https://zumaboletafu.weebly.com/uploads/1/3/1/4/131454272/9bee69140182.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374021/normal_5fe14efa11c14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5fe8e404cab9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409796/normal_5fec1d84da639.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/towutoginadivu/medirid.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/magazine_contents_page_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/95771695647.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/maine_pyar_kiya_full_movie_123mkv.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/gisupenubevusotenot.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/excel_dashboard_template_hr.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/wobozekememu.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/informatica_mdm_10._3_installation_guide.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_off0000e173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE173 5308 bytes
SHA-256: 1419dff72f78673df544bda16f5e0c41342133991dc91ea24aa33690ba7c22d6
font_01_sfnt_off0000f365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 10656 bytes
SHA-256: 2ce0d2662d42589c93b1bd3d2de64fe53030e37ca5631a63e847349da15bc5bb

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