Malicious PDF — malware analysis report

Static analysis result for SHA-256 438066a63c585e9d…

MALICIOUS

PDF

76.5 KB Created: 2021-03-29 18:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 20db58a771a55f17186cf15de91195d9 SHA-1: 4bb395435ac98bcbc9698bcdbd7ad6d7da05647b SHA-256: 438066a63c585e9d0ccfa52a20e035ac03a47113460502804510dfc19e0984ab
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to technical manuals, aiming to trick users into clicking malicious links. The presence of numerous links on disposable hosting further supports a phishing or redirection scheme.

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/award?keyword=cat+416+backhoe+operator+manual+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4387230/normal_5ffbb50528cda.pdfIn PDF document text
    • http://wujumelugesebem.22web.org/nexis.pdfIn PDF document text
    • http://xudisoda.66ghz.com/zimepedofuveketuzuvoruxil.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/real_estate_agent_referral_agreement_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_6040e7e72fd92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366405/normal_5ffa855ca89f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_60100043c67ba.pdfIn PDF document text
    • http://kersita.space/zuripijadurugepigagesilur7stn.pdfIn PDF document text
    • http://vquest.website/fikuxijowevufinuzasefilimklrp.pdfIn PDF document text
    • http://avto-trokot.xyz/rojitavetupuvikusudun78dkf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_600c549f58a9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wutodabegaf.epizy.com/vibub.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/5575475812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36cef59f-f15a-4d8e-a1ac-0466a76a2d26/words_to_describe_something_touching.pdfIn PDF document text
    • http://regipikiwubadov.epizy.com/80556179449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c60784a1-93b7-469a-a8dd-8e8aee57646d/toefl_answer_sheet_download.pdfIn PDF document text
    • http://mivogunav.rf.gd/mujupudenubaxafu.pdfIn PDF document text
    • http://xumerapugegivo.epizy.com/taxable_annual_payment_report_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de1fd8a6-0a6e-48cd-84bc-15b008458ff4/how_to_install_sq8_mini_dv_camera.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/repokefozez.pdfIn PDF document text
    • http://nidolivudazos.rf.gd/vista_128bp_programming_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/37450106150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7043a01c-8ccb-4499-9c76-66a7a36f0443/52303722196.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_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 5620 bytes
SHA-256: b3dc87be842a51ded6e8ca744f8b588d1be9aa7454332066cb13badb9467dcb6
font_01_sfnt_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 11452 bytes
SHA-256: 3722906d0655f45c46008c7d755d74c6a5c443843e46178cffae716b7732fc5e