Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa325df2c38294a0…

MALICIOUS

PDF

79.4 KB Created: 2021-04-06 13:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0ee3eca7b1377a984af88c163830c19d SHA-1: 435d18fcef7f40f44556a9e90ac9673b624befa0 SHA-256: aa325df2c38294a04b963c4f1d55791a0d40d335ab23d46d92bbf722ea17af0e
186 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 designed to distribute malware or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded links likely lead to further stages of infection or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://botokaw.ru/strik?utm_term=dork+diaries+12+read+online+free+full+book PDF link annotation
    • http://nedavupagisezim.mygamesonline.org/73657510755.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368243/normal_5ffc53d981522.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457011/normal_5fc6c649c4f55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366348/normal_5fd04bb122fcf.pdfIn PDF document text
    • http://zipemefud.22web.org/causas_y_consecuencias_de_la_contaminacion_atmosferica.pdfIn PDF document text
    • http://doruguduku.iblogger.org/31709252612.pdfIn PDF document text
    • http://lozomaneje.getenjoyment.net/subtraction_with_regrouping_worksheets_4th_grade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tigefaxoweta.rf.gd/personal_allowances_worksheet_claim_0.pdfIn PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_26f543d5181d4bacbc52c4328502fbc9.pdf?index=trueIn PDF document text
    • http://zijipowatik.epizy.com/27994473586.pdfIn PDF document text
    • http://fogovulosuzan.onlinewebshop.net/cancer_colon_sintomas.pdfIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_9fc249f9424c4548b636822fadc69e10.pdf?index=trueIn PDF document text
    • https://3ea853e4-7f2b-4fb0-9229-b04907a1e321.filesusr.com/ugd/d94095_cb1884dece8744b58d6fb70b86ca92a0.pdf?index=trueIn PDF document text
    • http://bewexenu.epizy.com/amway_product_list_2020.pdfIn PDF document text
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_d59cb7df2ec54556b69fd727c4f775c4.pdf?index=trueIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_5da1fff83969406692b73c35dd4ce9d6.pdf?index=trueIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_bf3ea41f77e748708c0ac24f8974ceea.pdf?index=trueIn PDF document text
    • http://mukukukeban.rf.gd/vutebef.pdfIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_2ea8523f09954ea596afabad2739d505.pdf?index=trueIn PDF document text
    • http://dupunijasazo.epizy.com/93478361784.pdfIn PDF document text
    • https://c9977776-9e37-4432-9eae-e541147807da.filesusr.com/ugd/bb6cc6_a84ca355dfaa4173943c3cbacc33cf22.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_c88d5903683542869c1c7e647ab36218.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_off0000f9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 5288 bytes
SHA-256: 606392a3e692d1177b0979d4b165e3f2a00005d30cd4b9e7f043bc90836018a7
font_01_sfnt_off00010c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 10484 bytes
SHA-256: 99a56b3c4dc448198bc1bebf593c919f33044bd2f3b59abb7cfb9fdc9e85186d