Malicious PDF — malware analysis report

Static analysis result for SHA-256 73789d3ee0cbd066…

MALICIOUS

PDF

73.7 KB Created: 2021-04-02 03:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d0005e91e91b19df1c2096245cf43078 SHA-1: 72f0a447f5e4d10614e814affc930780ce07dd45 SHA-256: 73789d3ee0cbd0667e58aed058e089ae3fde6acc0ede50f52ed00c315d449acb
192 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. It also features a visual download button lure, suggesting a phishing or scam attempt. The ML classifier strongly indicates maliciousness, and ClamAV confirms this with a 'Pdf.Phishing.Trojan' detection. The embedded URL leads to a known malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/award?keyword=astm+d638+pdf+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450898/normal_604b4f41f31f6.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/vgjNChg/17877479576.pdfIn PDF document text
    • https://banezinalirunod.weebly.com/uploads/1/3/1/4/131437453/1000407.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/3623703117.pdfIn PDF document text
    • https://soxajerufoxizas.weebly.com/uploads/1/3/4/8/134880654/4781240.pdfIn PDF document text
    • https://lobubanir.weebly.com/uploads/1/3/2/8/132814664/nodapu.pdfIn PDF document text
    • https://sonikimejikelo.weebly.com/uploads/1/3/2/6/132681145/8735153.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448096/normal_600669f483161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444638/normal_60414f7dc64de.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/X9k1geT/sutoximuj.pdfIn PDF document text
    • http://xokebidukefu.getenjoyment.net/what_is_the_us_constitution_for.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/hbgj1bH/cake_maker_2_my_cake_shoppe.pdfIn PDF document text
    • https://cdn.sqhk.co/bodorosuzuta/xUhisge/rinugotadafobesapazenolun.pdfIn PDF document text
    • http://gezakiribonenin.mywebcommunity.org/ankle_sprain_exercises_spanish.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/0fc1b55b-6d12-4096-9fc4-6d0f9341e5a2/gijejesovem.pdfIn PDF document text
    • https://e108c0fa-8e70-4110-aab7-e0d30777705f.filesusr.com/ugd/d9966b_037f4b4c442f4b5e9b1178112695eea1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/909f6f9b-2c0a-4034-8dcd-380f5ae24d74/coh2o6_br3_name.pdfIn PDF document text
    • https://8c330184-3457-40de-b162-e34763a77ed1.filesusr.com/ugd/0aae61_af9d22c4a41f41cdb50eef7252a187c7.pdf?index=trueIn PDF document text
    • https://c11ab09e-384c-4904-8c79-5ef6f38008df.filesusr.com/ugd/7131a6_9ce0567838d644f48eb4d734c70a48c7.pdf?index=trueIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_42348f48c00449e8b7320faaba0ae5d3.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_off0000e125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 5444 bytes
SHA-256: ec87d36e0ff17da65133521c4aa7013b5dd9f51b6ebee215f254a4b455afea6a
font_01_sfnt_off0000f396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 11084 bytes
SHA-256: fc8525d27c7ed36ff3f119309893e80f4fdc7fc65bab734722c6f1651a4a0f42