Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db9222a94158407…

MALICIOUS

PDF

72.9 KB Created: 2021-04-02 04:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e7491606c209e9789eb10cf537e43e7f SHA-1: d52d369ed6ce1f58dd83e62132cda251efbba224 SHA-256: 5db9222a9415840766d4304ce5ebc31af5bdecc1b7cbc61701c02a115b47fd23
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

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://dafemum.ru/wix?keyword=woods+timer+instructions+tm1702 In PDF document text
    • https://wikejawuwe.weebly.com/uploads/1/3/1/4/131437941/533490.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/wwjhIhc/fufapekosuf.pdfIn PDF document text
    • http://titanovyi-filtr.ru/new_blob_typen6lmv.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/1628190186.pdfIn PDF document text
    • https://femovoba.weebly.com/uploads/1/3/0/7/130775826/6909486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375517/normal_6036c414af0ad.pdfIn PDF document text
    • http://sberhome.ru/writing_positive_behaviour_support_plans_trainingzxz6i.pdfIn PDF document text
    • http://private-channel.site/ill-_mannered_crossword_answerdl61h.pdfIn PDF document text
    • https://cdn.sqhk.co/nimuxugemu/hbhhRfw/gexujufan.pdfIn PDF document text
    • http://invitesistem.ru/how_to_pair_turtle_beach_stealth_600_gen_2_to_xbox_one8gr3m.pdfIn PDF document text
    • https://cdn.sqhk.co/kezomerameki/gjBVYUZ/vewodogip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379973/normal_604d0f77a75b8.pdfIn PDF document text
    • https://cdn.sqhk.co/berazanoga/ig00sgi/26207541472.pdfIn PDF document text
    • https://woninulanomawij.weebly.com/uploads/1/3/4/6/134670754/fotipab.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/dJNiigj/75934021392.pdfIn PDF document text
    • http://vovpomnim.ru/what_type_of_oil_does_kohler_engines_user7mz6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozuketitara.onlinewebshop.net/amplificateur_de_brillance_bloc_opratoire.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/joe_defranco_training_over_40.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/ohioguidestone_protect_program.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/43003212189.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_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 5260 bytes
SHA-256: 8d30d555a133e37deefcc24685b731768f63d112cf7401e31c41310cc452aa16
font_01_sfnt_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 10652 bytes
SHA-256: b662be4d8bc71dd3845de7b83e30425e9fd899153a436280d0bc84e13212da5f

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