Malicious PDF — malware analysis report

Static analysis result for SHA-256 598e4b55482115fb…

MALICIOUS

PDF

66.9 KB Created: 2020-11-20 23:17:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 05a3db3cba9273b6a2225a00adb35ec4 SHA-1: 99081ccbd0cdd1f82e13c2de26293a3e0d0ea958 SHA-256: 598e4b55482115fbfde3bd1400de4e1b36130815d0159af71f6b801a8ebb39a2
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 of which point to potentially malicious domains, indicating a link farm or phishing attempt. ClamAV and ML heuristics confirm this file is malicious, likely a phishing trojan. No scripts were extracted, but the presence of numerous external URIs suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/123?utm_term=activation+energy+of+hydrogen+diffusion PDF link annotation
    • https://bizowubojixix.weebly.com/uploads/1/3/4/2/134265373/bojefubanodogi-jegalepaxujiv-likab-tazagalapomom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421960/normal_5f98ab03c115a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5fa7cba72cbc8.pdfIn PDF document text
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/2976542.pdfIn PDF document text
    • https://nonegisetuku.weebly.com/uploads/1/3/4/8/134877303/7143008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_5fb728dc5bad9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3146fab-71a3-41f1-9da6-875d216ae027/87399843413.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/wufajewinagewisad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e226a1b5-40eb-4902-b4ee-8ec72a209e0e/fufetuvelabelarofonax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4592259c-d903-4e6d-866f-ccb6fd048b58/phantom_of_the_opera_songs_2011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c33eb0d8-a597-41e0-ba66-465ffe961801/96475791206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b5967b-9ec8-4601-8ca5-5c8c2d8b8d8c/diario_la_libertad_barranquilla_judiciales_hoy.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/gabulak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30243b2a-3314-4846-a933-1f890848f116/peaceful_warrior_book.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_off0000c8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F3 5404 bytes
SHA-256: 79f07b471774374ce1fdaeb6a669ffe2db6ff60c0178c88b65873c5a22083bae
font_01_sfnt_off0000db5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5C 10452 bytes
SHA-256: 603f9e86cc7a16847fa85e1cd8e61d6da3b84f782016889433f1be96cc094836

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