Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea441ca7436c7414…

MALICIOUS

PDF

84.5 KB Created: 2021-05-09 16:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e8dd801bdf90484892fa4b2e63041122 SHA-1: 8eb5ccbcba2f320ee3269bc6de55012888dd6275 SHA-256: ea441ca7436c7414e9aa0050deaa9c85da3000587ca984e5e6f980cd5ab4354f
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The primary malicious URL is https://dafemum.ru/strik?utm_term=sword+art+online+game+app+for+android, which is used to lure victims. While no scripts were explicitly extracted, the presence of malicious links and the ML classification strongly indicate a phishing or redirection attack. The document body, though heavily obfuscated, contains references that align with the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=sword+art+online+game+app+for+android In PDF document text
    • http://pujugekan.iblogger.org/fazituraxavuj.pdfIn PDF document text
    • http://xivobivivupe.mygamesonline.org/denebagaz.pdfIn PDF document text
    • http://lidedapomegila.iblogger.org/dedasubufutezowexajazigil.pdfIn PDF document text
    • http://wuvejabamivul.iblogger.org/doa_surah_yasin.pdfIn PDF document text
    • http://xatujazaxuta.iblogger.org/panewuve.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/anger_iceberg_free.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/jurovej.pdfIn PDF document text
    • http://norasuzajo.mywebcommunity.org/wudixen.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
    • https://s3.amazonaws.com/sumesawoxajew/electrochemical_cells_virtual_activity_answer_key.pdfIn PDF document text
    • http://faxupinunuwup.epizy.com/30277118284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d0b53a-8b89-481f-9fe2-0fbca4516918/32299036627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afde33df-7c02-45bf-9363-e5b251d4ee43/39232742480.pdfIn PDF document text
    • http://ridurosumebo.epizy.com/22011983645.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7b5cae2-9872-4514-bbbe-1c1e05570c26/tuwoxebelubanujunekimewa.pdfIn PDF document text
    • http://lalemifeluruka.epizy.com/at_period_end_brandon_company_estimates_that_1200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/890f34c4-6859-46b8-b75b-f1b0ce5f7f03/40077299905.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/python_interview_questions_with_answers.pdfIn PDF document text
    • http://rovututuxopi.epizy.com/34923224832.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/3d_video_editor_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f0279b-d50f-48d3-981b-1170a7969c75/lofis.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_off0000fdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 5164 bytes
SHA-256: 244a2cb78fa389ebb14241f0e35a4c010d3fd4a224d332a07fecd1933d283b4f
font_01_sfnt_off00010f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F46 10868 bytes
SHA-256: 38778a54e18182d77655ecce7c0e3831401ad2bc39cbfecb89b445baecdb315e
font_02_sfnt_off00013483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13483 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e