Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b3bf3782167a53…

MALICIOUS

PDF

80.9 KB Created: 2021-02-19 13:24:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 86cc1bb66e14f938153b3040b5b28e53 SHA-1: 70e6f6816919e3f22f9bbfa44fb062db00d190d6 SHA-256: c8b3bf3782167a53144eb5ebff112d57a4eed59f65d8fd2dbbb8ada40057eec2
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, many pointing to disposable domains and redirector infrastructure, suggesting a phishing or malware distribution scheme. The presence of a link to a known malicious redirector and the overall structure of a link farm on disposable hosting strongly indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=hormone+reset+diet+sara+gottfried In PDF document text
    • http://proita.space/675750288950xwjk.pdfIn PDF document text
    • http://netewe9.xyz/867328748tj2ee.pdfIn PDF document text
    • http://swiss-gear.store/petition_for_letters_testamentary_new_yorkgae1p.pdfIn PDF document text
    • http://reform-st.ru/wetatemoxonoxoxologolezsoh8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_600e08ce132a0.pdfIn PDF document text
    • http://copyright-rules-help.com/leona_lewis_bleeding_love_mp4_freezqst9.pdfIn PDF document text
    • https://xoluvaxabezil.weebly.com/uploads/1/3/4/3/134338990/5193688.pdfIn PDF document text
    • https://ponorevex.weebly.com/uploads/1/3/1/3/131398269/foxowizigalirize.pdfIn PDF document text
    • http://ubzvp.com/loote_she_s_all_yours_songegahq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wefubosapinu.rf.gd/sositeb.pdfIn PDF document text
    • http://koxepari.rf.gd/balance_sheet_account_reconciliation_in_sap.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_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 5156 bytes
SHA-256: 1f97f4c726bf19ca60210e985db333201969c8799eb2907b47cef07599cc193c
font_01_sfnt_off000111e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E1 10808 bytes
SHA-256: 433148c7416c79697173649bddc56d7f1066fd3f10adbfd95354cc8c3644c469

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