Malicious PDF — malware analysis report

Static analysis result for SHA-256 b227b6103a5cf7b1…

MALICIOUS

PDF

68.3 KB Created: 2021-01-19 09:55:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 903fe350a1e667041b028a18e0b6e97b SHA-1: b17bd29131fab40f0cb7f14a9111d71e90937922 SHA-256: b227b6103a5cf7b1ba314dac3fa88d99bf7c4201a4e0f570d0cbba824bd7854f
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 external URIs, with one prominent URL pointing to a link farm hosted on disposable domains, suggesting a phishing or ad-revenue generation scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to redirect users to potentially harmful 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://leonvi.ru/123?utm_term=poem+on+environment+day PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462046/normal_5fa5e1af617b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428083/normal_5fa05adf4224a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500453/normal_5fe3f767a83ac.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/bheii66/6228141107.pdfIn PDF document text
    • http://lesagotefawa.22web.org/40029970932.pdfIn PDF document text
    • http://fisuruwibowin.66ghz.com/cloudformation_get_s3_bucket_name.pdfIn PDF document text
    • https://cdn.sqhk.co/sututidogo/T8K44ie/mijukuse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livofos.epizy.com/graduation_gift_certificate_template_word.pdfIn PDF document text
    • http://jexititojule.rf.gd/sklearn_classification_report_multilabel.pdfIn PDF document text
    • http://goxakimolo.epizy.com/latest_bollywood_mp4_movies_free_2018.pdfIn PDF document text
    • http://memajale.epizy.com/mdpi_sustainability_template.pdfIn PDF document text
    • http://dixolasafu.epizy.com/41904646781.pdfIn PDF document text
    • http://memegimowa.epizy.com/scrambled_words_worksheets_esl.pdfIn PDF document text
    • http://gaxufaxurawago.epizy.com/10th_compartment_exam_2019_date_sheet.pdfIn PDF document text
    • http://jatomije.rf.gd/96682478059.pdfIn PDF document text
    • http://suvubojetixag.epizy.com/boxer_movie_mp4.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_off0000d144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD144 4924 bytes
SHA-256: 2623253ea48e6dbe382a3a8f76065a9b8129d8783cb46fdfd9a245ff720f3a22
font_01_sfnt_off0000e1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 10136 bytes
SHA-256: ce971a24c0d1e5e7f2f34e7e7783eaa3d934679601aa15059b6e4f357cda8a43

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