Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00cd3584d16fac2…

MALICIOUS

PDF

78.7 KB Created: 2021-03-22 07:11:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1688a892c3f94ff9a398202788613623 SHA-1: 2342d7f4fa6372a99bd5ce88bb02ffcddb09ed3e SHA-256: c00cd3584d16fac28c3ef37b79edec5f5c62c849ca9f28f9d357eaf9c0228d8f
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded links, many of which point to disposable domains and known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to scoliosis, suggesting a lure to attract clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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/strik?utm_term=what+are+the+chances+of+my+child+having+scoliosis In PDF document text
    • http://dugarudewemudo.sportsontheweb.net/nejukesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485705/normal_6054b5605365e.pdfIn PDF document text
    • http://saroforati.medianewsonline.com/behringer_xenyx_x2222_service_manual.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/kabir_amritvani_lyrics.pdfIn PDF document text
    • http://zugasanuko.getenjoyment.net/kutiwanerusorunumasirim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488574/normal_5ff59d76b5342.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/acls_provider_manual_2020_free.pdfIn PDF document text
    • http://janipuwibir.mywebcommunity.org/cello_quartet_sheet_music.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/82775751127.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408190/normal_600287b00c826.pdfIn PDF document text
    • http://bewilotaweje.mywebcommunity.org/soccer_drills_with_cones_videos.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/football_drills_using_cones.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/22244798516.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/35995796572.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476146/normal_5fcd7cde95645.pdfIn PDF document text
    • http://mebovedu.getenjoyment.net/70478011130.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogivuwe.onlinewebshop.net/how_to_implement_baby_whisperer.pdfIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_dd6b6f56da3648439c38a5791ac04fbf.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_35e6675886f3436ab4450c69c922a9fb.pdf?index=trueIn PDF document text
    • http://zipemoluligera.myartsonline.com/nabuwizubi.pdfIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_2c19f05fca5f4e20a1041a7107ad8228.pdf?index=trueIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_8dac324fbc7b4a5da96856b90b96f74c.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_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 5612 bytes
SHA-256: 9ff887b80aeeb5341c5f3431a108f13b2ba4c6c2a0a72b11794e28e527a0781d
font_01_sfnt_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 11240 bytes
SHA-256: b5b28437c3c7a9948f586192b1f8236e50a8d1eaaf2edba5af9a00fb7797f1ff

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