Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5c272d3ed5426d…

MALICIOUS

PDF

101.1 KB Created: 2021-05-23 20:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1534c7b3c6e6f16256e7b86cb68103a3 SHA-1: 2b7bb09a737e89a0e7cc540727beb85ebcbdd2a9 SHA-256: 5f5c272d3ed5426d0751cf84c4966193b34732ed7728f492e81c654732346ce3
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary URL, 'https://mezovuduw.ru/strik?utm_term=pokemon+game+download+apk+for+jio', indicates a lure for game downloads. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/strik?utm_term=pokemon+game+download+apk+for+jio PDF link annotation
    • https://juzunuxav.weebly.com/uploads/1/3/4/3/134316531/16f3bb7cd0c.pdfIn PDF document text
    • https://nimizinimaji.weebly.com/uploads/1/3/4/7/134703428/sajixomevut_tijutobofete_vobivosolelomes_rekilinomogerig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393041/normal_6042eb6da08c3.pdfIn PDF document text
    • https://bokonuso.weebly.com/uploads/1/3/4/6/134604328/likiweginopo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366324/normal_5ff5e7c4b9999.pdfIn PDF document text
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/detivejanozilatit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405194/normal_6037509293a17.pdfIn PDF document text
    • https://nobujudiwid.weebly.com/uploads/1/3/1/4/131452838/7683757.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403672/normal_5fe123856540a.pdfIn PDF document text
    • https://tulixepatezapik.weebly.com/uploads/1/3/4/9/134902644/mibajopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_606e607225d9b.pdfIn PDF document text
    • https://daliroxemonove.weebly.com/uploads/1/3/0/7/130775241/6480885.pdfIn PDF document text
    • https://ruzepekipup.weebly.com/uploads/1/3/1/3/131398244/nuwuva_bijijodadutit_zikeg.pdfIn PDF document text
    • https://mefimume.weebly.com/uploads/1/3/1/4/131437875/posoxurumidi_xutobufowi_lugakerir.pdfIn PDF document text
    • https://motanaweda.weebly.com/uploads/1/3/4/3/134316912/dutosevazixo-timuza-wipido.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/b9dcc900-87c2-497d-8b04-69c4eadb137f/harry_potter_book_review_goblet_of_fire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7058ea53-7563-4da1-90c1-ce2a542fbebc/20198476910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18513ac9-4c72-4b2a-b549-61839a22158a/knowledge_base_management_system_open_source.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb17454-161b-4582-b3a2-af2d8375e716/canon_powershot_a520_maximum_sd_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d4ffd1-ddf2-42e6-bf22-037be522b864/tobowov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d895f62-64d6-406b-a8a7-413ad8b3deb3/52899697460.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D45 3876 bytes
SHA-256: 5c7249727fd075087d19ee3d7c60f10da5135977c91ad634652b74e049d87f71
font_01_sfnt_off00014b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B18 5416 bytes
SHA-256: 03aa8d0fc9dc4ca48304a10b4d478794523b645b0aba0d11348c41bb6eca6ed5
font_02_sfnt_off00015d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D8B 12192 bytes
SHA-256: 3e83f74dbb81fbf7b9d18120599b1172f7a42b85c2478c496ea07552c5bc484c