Malicious PDF — malware analysis report

Static analysis result for SHA-256 129cb8c462555f59…

MALICIOUS

PDF

79.1 KB Created: 2021-03-15 20:59:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0a19614fcf9543cc4a826bf6719a9962 SHA-1: bb29990ed44d2e0095b1e720660547871c65f4ef SHA-256: 129cb8c462555f5992f089e86a5141601ca674a64725ad9c715ba8954dbab348
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by both ML classification and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs that likely lead to malicious content or further infection vectors. The presence of multiple external links on disposable hosting suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/strik?utm_term=verbos+en+ingles+para+ni%25C3%25B1os+de+cuarto+de+primaria PDF link annotation
    • http://tubunasozejut.22web.org/cs_go_android_online.pdfIn PDF document text
    • https://cdn.sqhk.co/nupumusu/3NhfjiD/mewutexovujajararol.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/BihFrLT/suzesegatoporigaf.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/hfLjhhf/malasuzumiguwubexem.pdfIn PDF document text
    • http://axecheat5.xyz/doxaxululemewuri1p582.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/jcoijlp/zavivijubosufugotuj.pdfIn PDF document text
    • https://cdn.sqhk.co/woxewoxe/jcR77Is/sinusitis_antibiotic_treatment_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/EjcW5id/final_fantasy_brave_exvius_chaining_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/jijhegf/fun_reading_activities_for_4th_grade.pdfIn PDF document text
    • http://heleogose.online/android_tutorial_for_beginners_202030qms.pdfIn PDF document text
    • https://cdn.sqhk.co/tomijupef/jefXvlg/acholi_language.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/aifC1vL/shaq_fu_a_legend_reborn_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/vekokoze/1QiePhb/87805415302.pdfIn PDF document text
    • https://cdn.sqhk.co/lunilageruvu/iT3t0YV/optec_1000_vision_tester_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/fudimesa/jd1hgpR/circus_tightrope_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/rirelolut/Lifsgd0/37638710829.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_32b20049f26947af8552e3c652bc9a64.pdf?index=trueIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_f24938f310bb415cb5645aec5df10c07.pdf?index=trueIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_897bf945304e4a8eac9b8208477fb19a.pdf?index=trueIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_cd32d1d61daf427d8506f63b611dae81.pdf?index=trueIn PDF document text
    • http://mirurisiruxowal.epizy.com/research_paper_apa_style.pdfIn PDF document text
    • http://mifaropofim.epizy.com/john_deere_x304_dethatcher_attachment.pdfIn PDF document text
    • http://roxegubipav.epizy.com/how_to_change_genie_garage_code.pdfIn PDF document text
    • http://vesunak.rf.gd/feelings_and_emotions_vocabulary_list.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_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 5708 bytes
SHA-256: 8c24ada495da1247c6b862ad9b63d06a9f8fe171971b6b51856f2ff56a95035f
font_01_sfnt_off0001068c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 11520 bytes
SHA-256: 8ab85e241122396ddf81bbaca3143cd5a0baa468849d11a72da15f318771486d