Malicious PDF — malware analysis report

Static analysis result for SHA-256 39289345bb02df6f…

MALICIOUS

PDF

83.8 KB Created: 2021-03-16 05:58:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: def1a528db42ef47e405cfb14c400854 SHA-1: fb5f680c07fdb092b37c7f7ed116e5ade7b2b60b SHA-256: 39289345bb02df6fd79e07b61eb35c87305dd33ce0a1f71d5f4a4c18c986b270
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards malicious activity.

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://leonvi.ru/award?keyword=denzinger+el+magisterio+de+la+iglesia+pdf PDF link annotation
    • http://shtangelkipokupkiitd.online/fokuxafapovakomkxv2.pdfIn PDF document text
    • http://remoliwagofaju.mywebcommunity.org/76259171833.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/81966649742.pdfIn PDF document text
    • http://mopowataxix.medianewsonline.com/67777947934.pdfIn PDF document text
    • http://vanlit.ru/kismat_full_movie_downloadqd8r1.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/jutenojamega/50703046812.pdfIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_047af861f98e4479877eb6428e2184c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/waduzirader/27323604570.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_ff77178a017a4eaca73a1e6b89a49cf8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/ganoderma_lucidum_mushroom.pdfIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_4a4595419943407aaf8bd77dbc23e02a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5cf973-8ecc-42c0-8375-d4708c9bbb26/fojawibigu.pdfIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_e5b1e3b399a846b3ab11edb718325a19.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/99996595623.pdfIn PDF document text
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_a58b7470a2eb4c0e9974619a413890b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/35705c63-1b99-497d-af0f-da8c2cf5c441/hoover_vacuum_cleaner_user_manuals.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_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 5412 bytes
SHA-256: 9b562faf19812b44695d20bfadaabed7041f7af5dc85b02a61c22c3e6ca09725
font_01_sfnt_off00011a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A39 12472 bytes
SHA-256: 9a9398730f603eb093c4303ea7613378fb734465548641c3cd48ae9238db4f8f

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