Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ca70b1ccc75355…

MALICIOUS

PDF

73.8 KB Created: 2021-01-23 18:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 36e16b984b86639d50ce44c7de1de815 SHA-1: b12eb1278c9c6e8d921229662f0091d3f5ea92b0 SHA-256: 28ca70b1ccc75355f40c9363dd8361ee6cfbcf9c9990bec4eafb23769e92e503
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/wb?keyword=my%20cloud%204tb%20wdbctl0040hwt In PDF document text
    • http://jesofafisozosa.iblogger.org/management_consulting_case_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/LgcnggI/kizemujoze.pdfIn PDF document text
    • https://site-1178097.mozfiles.com/files/1178097/71727945534.pdfIn PDF document text
    • https://site-1250159.mozfiles.com/files/1250159/google_play_store_android_2__2.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedifi/digvhbP/vitamin_c_powder_benefits.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/2ZjjxN1/nolimudoburotoreruv.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/haihggX/vegas_city_gangster_mod_apk_android.pdfIn PDF document text
    • https://cdn.sqhk.co/semobisugigi/agcGBhh/36954248167.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453732/normal_5fcbd2ae83344.pdfIn PDF document text
    • https://cdn.sqhk.co/semobisugigi/gfjjc0Z/preschool_assistant_director_jobs_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/tijanukubo/fhcjihc/37027860905.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://velumosak.epizy.com/78255087570.pdfIn PDF document text
    • http://lizolubemerawi.epizy.com/lukutariweziwodup.pdfIn PDF document text
    • http://goduzidexemave.epizy.com/eeg_report_format.pdfIn PDF document text
    • http://xilibosukotijob.epizy.com/nucleo_accumbens_sistema_de_recompensa.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_off0000e3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E6 5112 bytes
SHA-256: fab680c3fab4fee6d88dc9d43e0ad460c837d00239a9e28a27557c7333f33dc4
font_01_sfnt_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 10868 bytes
SHA-256: 71387cec4c14dd1e42f1a6bda76b98006e3e9d08b73c1caaa02b6ae9cc656785