Malicious PDF — malware analysis report

Static analysis result for SHA-256 516caef429a963c2…

MALICIOUS

PDF

79.6 KB Created: 2021-02-16 21:53:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 231c6fcde0d5bf7c000040c9255c43ce SHA-1: 41658b5e358eac3cc7971ce727110523dbb7af28 SHA-256: 516caef429a963c28c431a445844ae2ce8a3851d03d450da1882a76b5e942129
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to 'binomial expansion', which is used to disguise the malicious intent of directing users to potentially harmful external sites. No scripts were extracted, but the PDF structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://bologen.ru/strik?utm_term=how+to+do+binomial+expansion+using+pascal%2527s+triangle PDF link annotation
    • http://linoveda.22web.org/389547937.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/RvjhTgu/helicopter_2_seater_for_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481164/normal_5fc67dc878ad0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_5fda710631df9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413977/normal_5ffd01833dbec.pdfIn PDF document text
    • http://goldenframecollision.com/free_bearded_man_vector5zivx.pdfIn PDF document text
    • http://pijevovonojatev.iblogger.org/6th_grade_math_module_2_answer_key.pdfIn PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/9331547.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481164/normal_5fc5b5c4bf5a5.pdfIn PDF document text
    • http://milky-rp.space/65080030491x0v3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383702/normal_5fcb4c35f1e17.pdfIn PDF document text
    • https://sebipujo.weebly.com/uploads/1/3/5/2/135294987/zafurenikaja_larulakemes_jikupovifobi.pdfIn PDF document text
    • https://vezefujofebiv.weebly.com/uploads/1/3/5/3/135304234/b73ef75.pdfIn PDF document text
    • http://yoptan.space/nujetoxoxixuvoruxufevtbo1.pdfIn PDF document text
    • http://naderuromopuru.22web.org/poweredge_t440_tower_server_datasheet.pdfIn PDF document text
    • http://maska-respirator.com/oceanhorn_2_switch_date_de_sortie39nby.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tupusivamiguta.rf.gd/12704391954.pdfIn PDF document text
    • http://lilaxeluven.epizy.com/sample_leave_letter_format_for_college_students.pdfIn PDF document text
    • http://gagolugumetuvo.epizy.com/avery_8160_template_mac_pages.pdfIn PDF document text
    • http://bavizajo.epizy.com/barnaba_isweke_mp4.pdfIn PDF document text
    • http://purevaxa.epizy.com/silk_bed_sheets_nz.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_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 5688 bytes
SHA-256: 2351752b054ea132d2929d7bd03f85d5ed92c9a237f62ef248cb2dabb4447b6b
font_01_sfnt_off000108c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 11496 bytes
SHA-256: 5860325fdb2112221a6da6c293099a96943bd833e2e0117ed8f4305f9a479604

Open this report in the interactive analyzer, or submit your own file for analysis.