Malicious PDF — malware analysis report

Static analysis result for SHA-256 feac96dba8d3f969…

MALICIOUS

PDF

73.5 KB Created: 2021-03-02 23:57:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 571b1778008a18daea1a89832c50cb31 SHA-1: 2c74af59b041d3b8af998df416467382330a62f7 SHA-256: feac96dba8d3f969afe64042f014537b598ad7c4121b0b6005a36ccbc5f21980
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=best+books+on+body+language+goodreads PDF link annotation
    • http://vkrowl.com/fesotijawuvadudiznbfy.pdfIn PDF document text
    • http://freud.icu/sifoj1rwzx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_5fd86a2d82387.pdfIn PDF document text
    • http://kimagibasip.22web.org/60243803697.pdfIn PDF document text
    • http://masalev.ru/usmle_first_aid_2019_vs_2020qcung.pdfIn PDF document text
    • https://mefifusefom.weebly.com/uploads/1/3/4/2/134266023/9173329.pdfIn PDF document text
    • https://metosiweliwig.weebly.com/uploads/1/3/5/3/135327441/7749784.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/tinizedubenajoridalitu.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/32880581678.pdfIn PDF document text
    • https://pepexelizuruxu.weebly.com/uploads/1/3/4/6/134656498/be24afa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412570/normal_5ffabe1ca3ec8.pdfIn PDF document text
    • https://rimokukesezawuk.weebly.com/uploads/1/3/1/4/131437069/8821218.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416656/normal_5fc66d7ac050d.pdfIn PDF document text
    • http://polikarmonolit.ru/lirajusigbaz7g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 5348 bytes
SHA-256: de6d5251041db2b0de7d081e70086bcf76a3b3863a64020a62799968a7342168
font_01_sfnt_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 10280 bytes
SHA-256: 8160d89fc6601ae15ce298bef6e4d5bd87f04b2594be13f5f4260976e75889a3

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