Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac02dd85447e1a7c…

MALICIOUS

PDF

80.7 KB Created: 2021-03-27 21:15:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d1c4b9e2af6f2978e15a6c8cd9c66698 SHA-1: 64b7ebab7a97a9f79f685169bb9f24e08e41ff53 SHA-256: ac02dd85447e1a7ceaa1f34cee688b8d5f817f33a7e7503d6ad461e76aad2da8
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to a suspicious domain, 'resalured.ru', which is likely part of a lure to download further malicious content. The PDF's structure and embedded links suggest it is designed to trick users into believing they are accessing legitimate educational resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://resalured.ru/award?keyword=10th+class+maths+all+formulas+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482882/normal_5ffa4dca0d9cd.pdfIn PDF document text
    • http://gasiwine.iblogger.org/11856798924.pdfIn PDF document text
    • http://trelon.fun/54845541954ce3us.pdfIn PDF document text
    • http://jepumir.22web.org/79950075975.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/how_to_login_to_seagate_goflex_home0ihkb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379374/normal_60560e4b2b30e.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/daa41ae1-7d05-46f7-9944-fc190fe470ef/swiffer_wet_jet_battery_replacement_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/galawazusilafegodofor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1447a4c1-ec61-45fc-8c10-46e64caf8578/is_les_mis_on_netflix_canada.pdfIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_13fc06dbb62840be931b73392698bab8.pdf?index=trueIn PDF document text
    • http://girodolud.rf.gd/breadth_first_search_algorithm_with_example.pdfIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_6f918e11a88a423c8750a4393d6aa4c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/free_bill_of_sale_form_nc_car.pdfIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_013d21b15e6c48308fe1344843fc6fe4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a0cf10d-053d-4431-aab7-0b7c2017d0d4/is_diesel_a_class_1_flammable_liquid.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_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 5588 bytes
SHA-256: d3d8a6d38e50779ed5c387fd86ead948f606d5693a73f6141fe258abbe12d8c9
font_01_sfnt_off00010c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C01 12228 bytes
SHA-256: 70f13e47ea7a34c493438cfe2fc4b80b7678499050a118957143236e30d48489

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