Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aace1c5116ffb9c…

MALICIOUS

PDF

76.2 KB Created: 2021-04-05 04:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5d733e18ae27ab847b47d295c89d64aa SHA-1: 7fc205756e2a805133f9fba65b6ad9f2dd73683f SHA-256: 0aace1c5116ffb9cd580146ab3e54d064d652dfaa5137eead34b5550937ad5d6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on directing users to `https://xajibur.ru/award?keyword=working+through+grief+and+loss+pdf`. This URL, along with others hosted on disposable domains, suggests a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the distribution of malware or redirection to malicious sites.

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
  • 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://xajibur.ru/award?keyword=working+through+grief+and+loss+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489050/normal_60209b9b23ca4.pdfIn PDF document text
    • http://muvibigi.22web.org/sovinugigali.pdfIn PDF document text
    • http://jipegifol.iblogger.org/architecture_for_blockchain_applications.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403406/normal_603e375fcde23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393759/normal_6012e81b9bc93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_6032f2f4b3345.pdfIn PDF document text
    • http://govegejemoluf.iblogger.org/fubajetidotosibela.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_9f47a6944858419d9d1530ffa33d013c.pdf?index=trueIn PDF document text
    • http://vivemowirarok.rf.gd/artistic_tamil_fonts_free.pdfIn PDF document text
    • http://degedudu.rf.gd/bayes_theorem_probability.pdfIn PDF document text
    • http://wovuluvoju.onlinewebshop.net/9319538574.pdfIn PDF document text
    • http://bopisumeku.atwebpages.com/oxford_dictionary_of_biology_download.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_261764ebcb894132973481207bdd541f.pdf?index=trueIn PDF document text
    • http://batogejupimole.rf.gd/bachelor_party_movie_video_songs_free.pdfIn PDF document text
    • http://kexafobe.rf.gd/90414782701.pdfIn PDF document text
    • http://dalefiza.rf.gd/sorupurugajuw.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_off0000ed76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 5380 bytes
SHA-256: 561ce651611014f3a6c58f0ff41c122291fbb0d133c9dadef9961b8e3b610c70
font_01_sfnt_off0000ffd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD4 10620 bytes
SHA-256: b8ca22de9a3027af82c90917428a3b7bdb30bb54b414efee57d1633e699e3055

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