Malicious PDF — malware analysis report

Static analysis result for SHA-256 671b52a1862330e9…

MALICIOUS

PDF

85.4 KB Created: 2021-03-09 19:58:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 06a59d181a27c67d7675a68d270dc682 SHA-1: e970859c0f181c8e848d57d6fd3ca2f78d615b70 SHA-256: 671b52a1862330e9cf091ba6c1428d8c8f00be109236a9f4fc74b6c5a5399509
126 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous external links to other PDFs hosted on disposable domains. The primary URL, 'https://soxebez.ru/wix?keyword=word+with+h', suggests a keyword-based redirection mechanism. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, pointing towards an attempt to manipulate search engine results or distribute traffic. No scripts were extracted, but the structure strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://soxebez.ru/wix?keyword=word+with+h PDF link annotation
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/rerilovutewofuse.pdfIn PDF document text
    • https://takesefitetipal.weebly.com/uploads/1/3/2/6/132682925/2547838.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/de399.pdfIn PDF document text
    • https://doxibizogo.weebly.com/uploads/1/3/4/8/134893922/7878784.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/ibE0Xjd/rowevobebizetelovugufo.pdfIn PDF document text
    • https://sizezowupoje.weebly.com/uploads/1/3/4/7/134704467/8283128.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/aKYqrjg/best_american_muscle_drag_car.pdfIn PDF document text
    • https://cdn.sqhk.co/podiwilur/hg05ugi/stack_it_up_storage_lubbock_texas.pdfIn PDF document text
    • http://zoluwofemofuper.sportsontheweb.net/zorupikovose.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
    • http://zogoxuf.atwebpages.com/maharashtra_b._ed_cet_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cda76d82-2fb4-4b2c-a663-759d40e327eb/70757957178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3e57464-2104-421c-9338-f52dec50d21e/best_wheels_for_manual_locking_hubs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce050262-eba7-41f0-8c22-40dd1ed141c2/why_was_girlboss_cancelled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e1efed1-1eda-4162-93e3-90bb08421639/24318429420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b845cb9-26bc-4c01-afb5-345ba12ba60d/how_to_draw_a_cat_easy_draw_so_cute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/915f862d-76b2-4f21-b32a-d9ded3e4576e/junuvigufelipasuwivuzivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add7e2f9-8265-4d36-bc3f-9a58dfa9eefc/used_vortech_mp10_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf5f82a-e155-48ef-b6c8-9a6fb4c903bc/how_do_you_write_a_good_self_evaluation_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f922af5-1cd4-402b-afdd-5fa7aded5594/trivadis_pl_sql_coding_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d4f296-f865-4fc5-b98a-1a045a19fe16/are_panasonic_dvd_players_region_free.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_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 4164 bytes
SHA-256: c64ad836d72e2c0f4d1a4466d16dc658a98cc8e26919399c7dbf3cda64f19247
font_01_sfnt_off000117ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117ED 10240 bytes
SHA-256: 8f9a80df2f11a0cac2745c5afa52f4a4082d2d4dea810a808035cfb423f46dc1
font_02_sfnt_off00013aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34