Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c81ff0acde8e8d5…

MALICIOUS

PDF

108.2 KB Created: 2021-03-24 20:38:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f8d9922ded89f84bd6c545c0fbb5a890 SHA-1: ccf2ccaa6f2108089c2ea2010a1a149a97d7d3e3 SHA-256: 6c81ff0acde8e8d5cbf90c715da0abfdd04994289f1da1ac8b3fcd86a51772ed
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites, potentially exploiting vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • 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
  • 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://kuzutuzo.ru/wix?keyword=cool+math+games+sheep PDF link annotation
    • https://lisobigu.weebly.com/uploads/1/3/1/6/131606175/rigusukepoz_sodolafurafafav_titasil_busewumuk.pdfIn PDF document text
    • https://kamabaxi.weebly.com/uploads/1/3/4/6/134650964/747fa8b.pdfIn PDF document text
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/9912dbd.pdfIn PDF document text
    • https://cdn.sqhk.co/pupewudoj/gY2ajjW/the_celestine_prophecy_movie_free.pdfIn PDF document text
    • http://renijulemigato.iblogger.org/bravura_boutique_size_guide.pdfIn PDF document text
    • https://fozaronu.weebly.com/uploads/1/3/5/3/135349809/tugeguxa_bupen_rogigafaj_kozobibob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485165/normal_60052f5a8809a.pdfIn PDF document text
    • https://cdn.sqhk.co/libewepigux/hjdihIw/zesejefiwitogubarog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407306/normal_600e8b829314d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446937/normal_604df422d4555.pdfIn PDF document text
    • https://cdn.sqhk.co/falupuvevore/biaRfhd/fubidezoragexejin.pdfIn PDF document text
    • https://miroguwitofenev.weebly.com/uploads/1/3/5/9/135958286/5410560.pdfIn PDF document text
    • http://xedekozis.22web.org/project_management_for_dummies_free_download.pdfIn PDF document text
    • https://vegivuben.weebly.com/uploads/1/3/4/6/134660922/5328879.pdfIn PDF document text
    • https://puvugemamoj.weebly.com/uploads/1/3/0/9/130969199/pixuzif-masun-leneke.pdfIn PDF document text
    • https://powilamalowigos.weebly.com/uploads/1/3/4/1/134131405/lafaludelar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486197/normal_5ffba9b3718fb.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/e2f89f46-7567-4a8f-87a6-ad16559a212b/how_to_fix_a_wobbly_kitchenaid_mixer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f696c784-ec2e-4277-a57c-38f9658d219a/what_do_mandate_of_heaven_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ee4af0-1623-425e-bcbb-0a4f3d202222/construction_covid_19_safety_plan_template.pdfIn PDF document text
    • http://bulexaresozo.rf.gd/25333392885.pdfIn PDF document text
    • http://nixewawomito.epizy.com/94015035113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc79b93a-3339-4f0c-85ae-2dc9dd15c833/g_shock_casio_wr20bar_mud_resist.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_off00016b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B1E 5044 bytes
SHA-256: 24833c4da1236c238baeefb85992c765abe26a015f6e0f506344b0dad6cfb019
font_01_sfnt_off00017c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C1A 11200 bytes
SHA-256: 1eca1049723d462e2753aa4c8af5f558aeebe8f31232f8c829cdff42f61d73e5