Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa8db3d6910f1d2…

MALICIOUS

PDF

80.4 KB Created: 2021-04-14 06:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a9a7d3e83c2654f8f80f137e5c665cad SHA-1: e873b42995d41912cd38310ccf2d2c30b36d3bb9 SHA-256: 3aa8db3d6910f1d248696e9fce1caedb8e1f05eff7d9d5477fd2111858ec4658
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dafemum.ru/strik?utm_term=what+is+the+best+offline+translator PDF link annotation
    • http://it50save.info/48328658080r73j7.pdfIn PDF document text
    • http://wiwovurezibaso.getenjoyment.net/igbt_vs_mosfet_vs_bjt.pdfIn PDF document text
    • http://nateribebomulaz.medianewsonline.com/86693581442.pdfIn PDF document text
    • https://gojazikur.weebly.com/uploads/1/3/5/9/135960276/fe44ea18.pdfIn PDF document text
    • https://xuwulusepe.weebly.com/uploads/1/3/5/3/135310973/wujiludo.pdfIn PDF document text
    • https://wubenigulusetib.weebly.com/uploads/1/3/4/7/134712949/sufuj.pdfIn PDF document text
    • http://bigijawiv.scienceontheweb.net/arret_cardiaque_cours.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://feelslike35.com/zawifapejubobogufwgnua.pdfIn PDF document text
    • http://nomiwiturej.getenjoyment.net/raripazujogowok.pdfIn PDF document text
    • http://nerazegizetikam.getenjoyment.net/87829674949.pdfIn PDF document text
    • https://visimekariluvog.weebly.com/uploads/1/3/1/4/131483525/gijenito_wolab.pdfIn PDF document text
    • https://petuxomurekag.weebly.com/uploads/1/3/0/8/130874153/vibesulijirof-debopapam-suxal-tujewofebi.pdfIn PDF document text
    • http://bexukavinawexov.mygamesonline.org/medical_leave_application_letter.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/ab7e454d-4542-4aad-8eb1-1d95a3fae0ef/jideminizi.pdfIn PDF document text
    • http://wumugajus.onlinewebshop.net/dubliners_araby.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d08a4600-a552-4f77-8f94-401d6ed6e061/kenmore_elite_microwave_door_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b054181-2333-482b-8ac5-7dccc856f3a5/attack_on_titan_wallpaper_eren_titan_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2176ff2b-02fe-4d4b-850b-6eee5ee19375/72413896024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/450f9bb3-ad20-4f34-92c8-afb42caf816c/schlage_electronic_lock_parts.pdfIn PDF document text
    • http://lanosebezazov.onlinewebshop.net/katobawanivaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/351d9984-3115-4943-8688-ee833cd13235/rubuvaxinepagolowiviv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1445eaf-c369-4cf2-b9c8-ea09e5b39f56/tedixebitapuviliwu.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_off0000fd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 5008 bytes
SHA-256: 8f0a80c960ea5678e3ed218c97aa17cc6293d11383aedcc03b85f15e63eef9a1
font_01_sfnt_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 10652 bytes
SHA-256: f99bf9d902a079edfcb9b28f266b54d413ca0d307e8f7e1a98fa675187db63a7