Malicious PDF — malware analysis report

Static analysis result for SHA-256 7239afa0f9ad6662…

MALICIOUS

PDF

76.3 KB Created: 2021-06-02 16:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1d2a274545a874474a5e3e44a642d93c SHA-1: 03a0d96502d7a313dd05091fd34cef8f4a73385d SHA-256: 7239afa0f9ad6662667ef0bac22ae7d447253ddecfbd631ddc2025235ce5187d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to 'allytemp.ru', a domain flagged as a link farm on disposable hosting. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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://allytemp.ru/pbw?utm_term=how+to+read+trumpet+sheet+music+for+beginners PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365653/normal_5fdd416396feb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374848/normal_5fec4b273552f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420018/normal_6063d51dc3f45.pdfIn PDF document text
    • https://fujimerikav.weebly.com/uploads/1/3/4/3/134307110/gudoporevibika.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472204/normal_5fe8767206742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417025/normal_602a0035bb662.pdfIn PDF document text
    • https://vuvopovakufusoz.weebly.com/uploads/1/3/4/3/134342968/motibeg_nabufotanakesab_menewiraliperur_rasedelufedifik.pdfIn PDF document text
    • https://zexivavu.weebly.com/uploads/1/3/4/8/134872555/jiretokugek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406223/normal_5fc81aa12f41b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482002/normal_5fcad6a24df4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495037/normal_602d27e8659f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_60171d81c7af8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/95977ab1-835f-48df-899c-2985b62c47e2/brother_mfc-8710dw_wireless_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e42928d-f0c2-4559-aa80-8aa361e63c94/where_is_the_nearest_toyota_garage.pdfIn PDF document text
    • http://tarogifere.pbworks.com/f/19699457880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/475dd654-fe92-4b89-8541-edad6125d7d5/dibujos_de_mini_world_para_pintar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/308c3dd8-7d68-4a86-b604-ae6478976d3b/super_mario_bros_2_walkthrough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef3b6a3-1671-4705-b74f-71129c454a92/66586690376.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144511002/afterlight_2_free_download_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/399c26ff-b2e6-4d68-b886-acfaf04ee44f/19375704429.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/mabigubalujuzufar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c64bb57-e17a-43a3-88f2-68d17e8e50bc/can_i_use_my_nikon_d3100_as_a_webcam.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144428454/bavasojedewukijaxot.pdfIn PDF document text
    • http://ritijix.pbworks.com/f/97814204555.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_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 5612 bytes
SHA-256: dde238289ef96f904219732a7445c5a77f7140371a87b5f297cdb0e6c816016d
font_01_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 10012 bytes
SHA-256: da2d277603c0c219004c21476dafc9e8a9be1d286de2893a9daa39c8b2d84128
font_02_sfnt_off0001155c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3