Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec856e0d46172d3…

MALICIOUS

PDF

83.4 KB Created: 2021-04-04 03:40:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 74da47f2fa590d19efec63899f6da089 SHA-1: 51e43ca05b76c9c2dd0163bf8ef651938e6f14e8 SHA-256: dec856e0d46172d3f4d0c394298e7f54ef0fb2ce2c03a057f948d5901275f568
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. The presence of external URIs and the nature of the embedded links suggest the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://resalured.ru/award?keyword=alias+grace+livro+pdf PDF link annotation
    • https://cdn.sqhk.co/lojadisexudo/bEjefhi/dark_summoner_nu_wa.pdfIn PDF document text
    • http://dafagaketa.sportsontheweb.net/8470301568.pdfIn PDF document text
    • http://sallely.xyz/best_background_for_photo_editingmag5m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374708/normal_600f86102f01c.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/jihfJtA/zovokiwebaruteribini.pdfIn PDF document text
    • http://ruvenebigolusep.mywebcommunity.org/43923013584.pdfIn PDF document text
    • http://mydenverneighborhoods.com/16057496038co7j0.pdfIn PDF document text
    • http://medicalpracticementor.com/wewarowagozopafebemic3soe.pdfIn PDF document text
    • http://zikevamakag.mygamesonline.org/abac_air_compressor_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476936/normal_6008744bce522.pdfIn PDF document text
    • https://cdn.sqhk.co/xerejijasoma/ZrheCMP/sunday_school_lessons_prayer.pdfIn PDF document text
    • https://cdn.sqhk.co/gigemuji/iiat2hg/8151666695.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500186/normal_5ff4cd866ab67.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/gsorbkB/6879394020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_a76692aee9804410855ff25dd5eef21a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bcecd92-8ce9-499e-9492-986ca7a061cd/ruwatesagarogonewigowuj.pdfIn PDF document text
    • http://raxajabidadida.onlinewebshop.net/63830350652.pdfIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_c29d62e9b32648369404990766db39b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c968e93-0346-4a65-94a6-27448868d252/what_is_the_magna_carta_us_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce349e2-f35a-4c61-bf5b-358f63f7d0e8/52864653807.pdfIn PDF document text
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_f9702b2b97824e8ab6bc3d2cc006842e.pdf?index=trueIn 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_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 5372 bytes
SHA-256: 23c7df0ac4baf6b996725bad661beba1eb6e0364d04e6fb978d9fe2be034246e
font_01_sfnt_off00011ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 10912 bytes
SHA-256: 4f488052dbf4087c8ef573e74838cc1d66a44a2716b10e6ecba48800576430a0