Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd97402959dccd49…

MALICIOUS

PDF

84.7 KB Created: 2021-03-22 18:06:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ff9cb4804c4ebede4356c86b9847b255 SHA-1: 65b218d905aed24211138eef184125bcc3a11b18 SHA-256: cd97402959dccd4990da7c515f69f1bcc0323e8d945678acc022a9164be4e592
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=ejemplos+de+etapas+del+proceso+de+investigacion In PDF document text
    • https://cdn.sqhk.co/nalujujoso/I2hcjc9/lowap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378165/normal_6004dc6be0ecc.pdfIn PDF document text
    • https://cdn.sqhk.co/perikowep/hhfzKgj/14482562080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447096/normal_5fc8eab7badc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414336/normal_6016470775905.pdfIn PDF document text
    • https://cdn.sqhk.co/rovonoset/jagfgeU/house_designer_fix_and_flip_cheats_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/hijhhb3/nazunekesavujezupifum.pdfIn PDF document text
    • https://cdn.sqhk.co/fowifabibu/2u3heje/minecraft_skin_unicorn_girl_nova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_5fd1d0e478319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493589/normal_601bdf1d2c795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459164/normal_602a375a727f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393752/normal_60099406c4346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460473/normal_603ebb7f60c0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wafezejub.epizy.com/adjective_worksheet_with_answers.pdfIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_0bcb1b68e3204aae9d8e0836b52b52dd.pdf?index=trueIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_484c1bf59e244ef6a5b0bdf10245d899.pdf?index=trueIn PDF document text
    • http://kidereludabiron.epizy.com/personal_capital_investment_performance.pdfIn PDF document text
    • http://kixelekiteduxaz.rf.gd/sagarepotopukemagimod.pdfIn PDF document text
    • http://vapedefomagejev.epizy.com/63939684744.pdfIn PDF document text
    • http://bofawujataja.epizy.com/poesias_de_fernando_pessoa_em.pdfIn PDF document text
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_4ec9f13a0d1e42dcb796f3be6e5910a8.pdf?index=trueIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_da37198d7b514bf5887cbf23c5d05395.pdf?index=trueIn PDF document text
    • http://wupubobetob.epizy.com/kugalubesesoju.pdfIn PDF document text
    • http://tizovosavudufi.rf.gd/up_agriculture_online_form_2019.pdfIn PDF document text
    • http://nabunuwo.epizy.com/dawson_s_creek_episode_guide_season_2.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_off00010922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 5484 bytes
SHA-256: 91af9ac1fd1688abf6fadb94fab7376028343b18609417486092d7e491daff72
font_01_sfnt_off00011bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC5 12200 bytes
SHA-256: 221a2687200edaebb6332a12ec916f10044d068be8cec2ca92a3324406f98897