Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb0732e4a1cc9f5…

MALICIOUS

PDF

67.7 KB Created: 2021-02-16 17:07:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 13c35430f06703b140e4b0b30ed264e4 SHA-1: 934b7c42bded0d72b65bbd27c08f6532563de4c8 SHA-256: 2eb0732e4a1cc9f5d2e69dea717553b4277558b115fb887a113163df0be2954d
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded URLs and the PDF structure indicate a phishing or scam attempt, likely designed to redirect users to malicious sites for further exploitation. The ML classifier output of 0.999742 strongly supports the malicious classification.

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
  • 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=how+much+are+posi+joists In PDF document text
    • http://sunny-web.ru/862712697536kg0y.pdfIn PDF document text
    • http://goledipe.22web.org/brushfire_menu.pdfIn PDF document text
    • http://passive-income.ru/558519700763mv84.pdfIn PDF document text
    • http://wadopipojadali.iblogger.org/wijatofapimu.pdfIn PDF document text
    • http://justamorem.com/74210419675oua91.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/idjjxVf/mcat_registration_2020_pakistan.pdfIn PDF document text
    • https://cdn.sqhk.co/kusasuzona/gcgdhiP/text_twist_2_free_online_games.pdfIn PDF document text
    • http://tijukavuwoka.iblogger.org/vonuwulupefobe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fezibebub.rf.gd/xipotajare.pdfIn PDF document text
    • http://sidakofonol.epizy.com/subtitle_indonesia_descendants_2_2017.pdfIn PDF document text
    • http://zefixufedinokas.epizy.com/mugibuzutokofajebu.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/77035057807.pdfIn PDF document text
    • http://somizifiwij.epizy.com/bivedubevipiwopi.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/2847936306.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_off0000cca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA5 5268 bytes
SHA-256: 1837eff62eb58c5353c8db72988fe205b1844f67050587e5084e8cb8af1775bf
font_01_sfnt_off0000de78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE78 10548 bytes
SHA-256: 69256480de9164c0290a2aa4143bb8523a37a3cf7bddcf3369f97ee642597931

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