Malicious PDF — malware analysis report

Static analysis result for SHA-256 70bc073aee0d4a75…

MALICIOUS

PDF

75.3 KB Created: 2021-03-25 18:57:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3c45a81d159d0107ecd674b48e1eec32 SHA-1: d05efe9034d6b26ec3eeec7d2722abace729f1c6 SHA-256: 70bc073aee0d4a7570f6d6d854a2c0f33e085a99f183e7580b4639c44be8e5de
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary URL, https://jacksth.ru/strik?utm_term=what+is+belotero+filler+used+for, is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=what+is+belotero+filler+used+for PDF link annotation
    • https://rixeludabigadak.weebly.com/uploads/1/3/0/9/130969597/zopov_visufovete_fedejexovujub.pdfIn PDF document text
    • https://xijanejomasug.weebly.com/uploads/1/3/4/5/134506458/wibubunoj.pdfIn PDF document text
    • http://nusamovepi.22web.org/tisefi.pdfIn PDF document text
    • https://mefupajudeto.weebly.com/uploads/1/3/4/8/134883840/tadetexe_tepamelega_subureko.pdfIn PDF document text
    • https://gajarasanen.weebly.com/uploads/1/3/4/7/134714971/3309559.pdfIn PDF document text
    • http://matemepujibad.scienceontheweb.net/48500415995.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/796d4818-e046-461b-9c84-dbafbac81f74/oracion_de_la_corona_de_adviento_2020_primer_domingo.pdfIn PDF document text
    • http://gupizamowakop.myartsonline.com/84511136681.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/banco_bicentenario_nueva_plataforma_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ba70b5c-013b-4102-a8e6-94fb5cd34295/the_magicians_wiki_season_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c13419c-3ce7-4686-87bd-587f47296dcb/best_software_testing_course_online.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/christmas_tree_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abff6986-44ee-4dee-ba58-302b5e956e9c/rigozapo.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/product_catalogue_template_psd_free.pdfIn PDF document text
    • http://sewadereweben.epizy.com/4238204334.pdfIn PDF document text
    • http://rilokew.rf.gd/xajela.pdfIn PDF document text
    • http://vijanemafe.rf.gd/2365737037.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/adobe_reader_java_app_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/166a7619-62df-4353-a5fc-5a690fb386df/how_many_calories_in_a_daves_single.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c685456-6070-4229-9ce8-7dae7b101cb0/taruvabaruloba.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/naca_airfoils.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_off0000ec83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC83 5148 bytes
SHA-256: d5fea305bdc0a952327b90794c3148b5003e7b06ad323e5d45b42bc21ed7bcf8
font_01_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 9948 bytes
SHA-256: bb8d1b3447a3d46fc39a5dc08ac8c4f590f178e8b90ef0697235c65e3674a227