Malicious PDF — malware analysis report

Static analysis result for SHA-256 45394425378b9aa2…

MALICIOUS

PDF

82.9 KB Created: 2021-04-13 23:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7d8771ed97699992f8a7a1cedc1ff4c2 SHA-1: 2810d62cb6313f817edf8d52221d5cbc03919fa9 SHA-256: 45394425378b9aa2d1d4e0ef49d4fe08b761653ac91e23a6f4e3af61789d020f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with a 'utm_term' parameter indicates a potential phishing lure, disguised as a search result for a product. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/strik?utm_term=fisher+price+cradle+n+swing+battery PDF link annotation
    • https://gimexewevojux.weebly.com/uploads/1/3/4/5/134523505/lofod_tetukugox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468286/normal_604740c0a1a69.pdfIn PDF document text
    • http://nawumamarupojo.22web.org/wudapudakusililejifelaw.pdfIn PDF document text
    • http://bovakepixoworax.iblogger.org/bioelectricity_plonsey_free_download.pdfIn PDF document text
    • https://rixemovupel.weebly.com/uploads/1/3/1/6/131606965/sexanalojonatikuno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5fd652b1b9eed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luvebex.rf.gd/fupedesizeporibiberid.pdfIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_aa8e33d222e84b9a92e76a6a2f206214.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/anonymizer_free_trial.pdfIn PDF document text
    • http://vanuxulo.rf.gd/62254974471.pdfIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_d59740a6c09c4d18b52752be7034c37a.pdf?index=trueIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_b46e42e0ef2340a98eb97cea9d2f4490.pdf?index=trueIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_0bbcae3959b84046b65ff8bc63cb4ece.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/juzevadidisopupidako.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/norton_antivirus_security_apk_full_version.pdfIn PDF document text
    • http://farekoze.epizy.com/safety_officer_interview_questions_and_answers_file_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/nurusavixorofisafome.pdfIn PDF document text
    • http://leparitupoxow.onlinewebshop.net/tesis_contabilidad_y_auditoria.pdfIn PDF document text
    • http://nitubak.atwebpages.com/sipogifexogana.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/zilijutowivefi.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_off00010621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 5624 bytes
SHA-256: 8a4de53d0dbbe6563e85d9a1669a92636b5fbb777d3d09726556f58758524cac
font_01_sfnt_off0001194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 10948 bytes
SHA-256: 288732a7768f9205cf45dfcbaa6370e456a14f85443bb612399abcd83848571e

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