Malicious PDF — malware analysis report

Static analysis result for SHA-256 12bca987556693d7…

MALICIOUS

PDF

84.9 KB Created: 2021-04-18 08:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 504840f6faacad3c3cf073234e7e8d74 SHA-1: c55cff51977dc0227ec889f547c39be08d16086f SHA-256: 12bca987556693d790ff13048565d27604454572a0f52b1e35f61cb9424a7d7b
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 0.9995

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://bologen.ru/strik?utm_term=can+a+garment+steamer+replace+an+iron PDF link annotation
    • https://cdn.sqhk.co/batumozi/dxeheia/butajixad.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/xnZnihc/last_day_on_earth_survival_pc_emulator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383921/normal_606c6c4b62223.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393193/normal_5fdda997f20ec.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/ha8vgit/auto_clicker_automatic_tap_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/ihhNNxe/calendar_2021_january_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/vamosopon/Mibjaji/44906531999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_602aa5ab22e65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449399/normal_60652290b7dec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450154/normal_60188695e1c9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413119/normal_603632da2afd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458124/normal_6000d91889a51.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/hagfUPc/47629148346.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://bukaduxanob.epizy.com/a5_booklet_template.pdfIn PDF document text
    • http://deniwejatugege.epizy.com/dream_achievers_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94578044-dcd6-473e-adfb-865c1dbed431/sawedijafosimitoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0d5a17-fe60-4754-b691-16b5a223ec57/kazorasexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7f0581a-df2e-4487-8343-ac5829b04437/xowinopowete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4be28f8e-f4eb-48a9-a8a4-c5079a6d799f/pronoun_worksheet_for_class_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b5b6a8-d54e-48bf-9e56-c8645e3af339/45780821554.pdfIn PDF document text
    • http://pakebixulo.epizy.com/a_fistful_of_dynamite_sheet_music.pdfIn PDF document text
    • http://nisugaraxefubo.rf.gd/zugerutixejebakizix.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_off0001014f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 5064 bytes
SHA-256: b1de5841288bf36c1f14cf759d6c0ea985501b562057cb5c930340d6220d1af5
font_01_sfnt_off0001126d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126D 10864 bytes
SHA-256: a9f7e632fb58619c84b298d9be65cec3825cfd03261b9267beff3142da9480ef
font_02_sfnt_off000137b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B5 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230