Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda98bc1f10aed5a…

MALICIOUS

PDF

74.7 KB Created: 2021-04-03 03:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4ca65b27ee261103260646d07fbded45 SHA-1: 821c0f4c8278887622761bb5a3de57c03d37abb7 SHA-256: eda98bc1f10aed5ac6b7eb74ea06a42638012fa97b8bd6556c9c1367c185022b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, strongly suggests a phishing or malicious redirection attempt. The ML classifier also indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to obscure its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://soxebez.ru/strik?utm_term=udemy+python+for+data+science+and+machine+learning+bootcamp_git.ir PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489740/normal_605f4e0da64b0.pdfIn PDF document text
    • http://jalukevevisewe.iblogger.org/what_if_netflix_show_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426832/normal_600fe75de2a0f.pdfIn PDF document text
    • http://openplafond.xyz/15820275826q926o.pdfIn PDF document text
    • http://susobokilodos.iblogger.org/80720208533.pdfIn PDF document text
    • http://wdd13.ru/xexebum0tecl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414342/normal_6017ddd0ce4a3.pdfIn PDF document text
    • http://idealicaitalia-official.site/75634843932ptk08.pdfIn PDF document text
    • http://sq11mini.com/429655295960wt5w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_604d9521cd0c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370740/normal_6065c7fae183a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382413/normal_601c7952b516b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467318/normal_5fe1ce025fb17.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/13d2f6c1-5ea0-417c-8513-58a4c3a0ed3b/how_to_treat_severe_acne_while_pregnant.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/lenovo_t430_core_i7_specifications.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/35968529763.pdfIn PDF document text
    • http://fexusat.epizy.com/wexomunuxaxobed.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/administracion_de_medicamentos_via_intramuscular_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/print_july_2018_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/genebagob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faa6e60d-eb64-4de5-aad3-cc07277d46e4/45450682363.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_off0000e46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46A 5864 bytes
SHA-256: cdbd60fb6905121db7375e83db764fa0bf75407c1069cce2c349d2049fd7a3ad
font_01_sfnt_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 10684 bytes
SHA-256: db5422ab86aa0ea70b7d32252c102bd33795de4e7a75b272b55de493fd679d46

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