Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87565c0fb8c1fff…

MALICIOUS

PDF

75.7 KB Created: 2021-04-07 00:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 200a0adb4bc61cbc24a9fad3c0925661 SHA-1: 0dee397b40617b887cf02fc58dfa967cb368a33d SHA-256: b87565c0fb8c1fffd7f562bb43b91fe829661c7e6809706bf3b21549256ccb4a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or redirection mechanism. The primary malicious URL identified is https://mezovuv.ru/award?keyword=wearable+biosensors+seminar+report+pdf, which is likely used to host or redirect to malicious content.

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://mezovuduw.ru/award?keyword=wearable+biosensors+seminar+report+pdf PDF link annotation
    • http://about-igsupport.com/terigemikugoy577q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471109/normal_606caf3b9e3d0.pdfIn PDF document text
    • http://zarewubizeno.mywebcommunity.org/dimagu.pdfIn PDF document text
    • http://luminar2-download.xyz/910705145585i54d.pdfIn PDF document text
    • http://alkostore.xyz/549685657877mq57.pdfIn PDF document text
    • http://saroforati.medianewsonline.com/83335067545.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/rubabanefelajabub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_5c8868b07ca04d149207dd2a04f22d28.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lazolu/kesepawunuras.pdfIn PDF document text
    • https://f7b0ef4b-317e-4f07-901b-4de91a029b50.filesusr.com/ugd/50f142_9a01fb7a57d44438b3341d12c43856c3.pdf?index=trueIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_f4f43c2b8dec48b186d04f68992a1737.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/tisato.pdfIn PDF document text
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_abfdf15726a945a39f4fc0504f12dcee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/21973608152.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/hallmark_harry_potter_book_ornament_2020.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_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 5340 bytes
SHA-256: 0cc90d5b9ba99d0fe9ac9bab62eaad50ed0825814ed434e4c05edc25af088217
font_01_sfnt_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 11976 bytes
SHA-256: 5e93aea7bd8f9653b65f31cac64255a7934f44e294c89305a99710e2b4bff597

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