Malicious PDF — malware analysis report

Static analysis result for SHA-256 04dc371a1ebbed93…

MALICIOUS

PDF

77.6 KB Created: 2021-04-01 03:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2eddbe510e28bafe9df44bcd3429a53c SHA-1: 7678e9690f32ddf12dcf6233e9c1b3acaa1c939b SHA-256: 04dc371a1ebbed934c7fe0a349269354b82702513470aa08584ccfaca91f8e6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/award?keyword=building+planning+and+design+by+kumaraswamy+pdf PDF link annotation
    • http://tonedomopoja.scienceontheweb.net/icao_annex_17_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/raqhcjb/90286525773.pdfIn PDF document text
    • https://cdn.sqhk.co/wabogojo/PigWPT6/pisapefirufilegip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420454/normal_600df08baa004.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/ge6ghuy/60279517989.pdfIn PDF document text
    • https://cdn.sqhk.co/gadowikuxe/VlLjjAb/python_3_string_format_integer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412379/normal_5ff1ec5e13fbf.pdfIn PDF document text
    • https://cdn.sqhk.co/fefavezevir/hejiqji/idle_human_2.pdfIn PDF document text
    • http://rixadixiji.scienceontheweb.net/occupational_english_test_for_doctors.pdfIn PDF document text
    • http://didazema.mypressonline.com/9491222799.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/dxeheia/butajixad.pdfIn PDF document text
    • https://cdn.sqhk.co/vevigagexoxa/o8qsngd/rider_vs_iona_prediction.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/Mahfnjf/extreme_car_driving_simulator_racing_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503309/normal_5fc5d89530b3c.pdfIn PDF document text
    • http://kulotufiw.mypressonline.com/xekavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_6027f3bbc8097.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/f00c35fc-f72d-4401-bc71-4dbf6f136d3e/pegijefupakozedubar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a77fe13b-1163-42c2-97d4-91a479c949c7/99156290668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b450aa97-1e6f-44ed-be33-6359b9fcab7b/polaroid_tablet_forgot_password.pdfIn PDF document text
    • http://logiweliziweje.onlinewebshop.net/mittlere_nderungsrate_aufgaben.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff161df-7d6c-49fa-8cd6-972e5bee6583/dewalt_20v_max_cordless_drill_combo.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/information_retrieval_course_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07411312-4678-45ad-8efd-a65f32081842/tawimelezakefezutijediveg.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/natatubepej.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/lol_tft_cheat_sheet_new.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_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 5808 bytes
SHA-256: a7c7a862b1b54840c165b04f36280325070f39cf36fc8db27c6147321380c342
font_01_sfnt_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 10736 bytes
SHA-256: b55bd9e099d6106875a21728c260cc50284e972a3d64ed70f9a3534154bf8dc9