Malicious PDF — malware analysis report

Static analysis result for SHA-256 0045cc28e4b13836…

MALICIOUS

PDF

73.0 KB Created: 2021-03-15 09:29:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 967b1452014ec6403d4eb7140db555a7 SHA-1: 23688ea7b5c10233536e4efa730201abda8c52ad SHA-256: 0045cc28e4b1383649caec0bf151014bfef6d03e2d4190ea0973e6ef3aee7483
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://golowaki.ru/strik?utm_term=panasonic+telefon+kx-tga660ex PDF link annotation
    • http://0fruits.space/trig_identities_non_right_trianglect77f.pdfIn PDF document text
    • http://dokusamatofapig.iblogger.org/princeton_algorithms_4th_edition.pdfIn PDF document text
    • http://gobigs.space/80278747700fyo56.pdfIn PDF document text
    • http://spindlndou.space/besomekuwawibirowuda8mc.pdfIn PDF document text
    • http://kovatafob.mypressonline.com/how_to_develop_study_skills.pdfIn PDF document text
    • http://mobokem.iblogger.org/nodotojefowuw.pdfIn PDF document text
    • http://mozodulo.iblogger.org/layer_poultry_farming_project_report_1000_birds.pdfIn PDF document text
    • http://sajitalunaded.22web.org/blob_video_extension.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_7fbe4b041d5f4253a9de4b7570bed831.pdf?index=trueIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_58e1914e91f5402688539ad8e6e0dbc6.pdf?index=trueIn PDF document text
    • http://gakilasefit.myartsonline.com/laporan_praktikum_titrasi_redoks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81fd782d-f3f0-45e7-b190-cabcc876eaf7/factory_design_pattern_in_java_with_realtime_example.pdfIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_1d06d2ff0f484471970c31a55e4a9d32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/429a494d-4b8f-4727-a647-68b2bec12633/my_husbands_secret_life_synopsis.pdfIn PDF document text
    • http://gugamofizuxeg.epizy.com/data_structures_and_algorithms_in_swift.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_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 5412 bytes
SHA-256: 414dc07b7a4c55455bb0e77286c790bcdfafdf30fc9818f6908ced295e6c798a
font_01_sfnt_off0000ee70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 11980 bytes
SHA-256: 379548c41941de9ac91421fcee606eee97e0c3f5bb1a0ee7d050af351277bb60

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