Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ea85ec3a1dd0e5…

MALICIOUS

PDF

71.2 KB Created: 2021-03-05 07:13:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: ab0583284c561e7c2a0405a6a9cbe008 SHA-1: d1088247f2862add84add2054bb682fbf6de0356 SHA-256: 51ea85ec3a1dd0e5ef18652184b967739d671f9b27e44297961711bbf99b3479
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation.

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/award?keyword=is+xvid+codec+safe+to+install PDF link annotation
    • http://wagikopegufiza.66ghz.com/android_autocompletetextview_clear_adapter.pdfIn PDF document text
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/lojuperafoj.pdfIn PDF document text
    • http://sinelejijona.22web.org/vewedipuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481065/normal_6014b7f337e9f.pdfIn PDF document text
    • https://rufevefiwavanu.weebly.com/uploads/1/3/5/9/135992343/dexifot.pdfIn PDF document text
    • https://xapetivaxi.weebly.com/uploads/1/3/5/3/135347241/3256df01ca99.pdfIn PDF document text
    • https://soxajerufoxizas.weebly.com/uploads/1/3/4/8/134880654/diwadatomuriw-gewudipa-bimokedupegede.pdfIn PDF document text
    • http://fosufupivufup.66ghz.com/pikubebawaselijobaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449600/normal_5fe103994d617.pdfIn PDF document text
    • http://nokobefisedo.iblogger.org/cholesterol_lowering_meal_plan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500446/normal_603598fc3c7b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411245/normal_5fc5becb0a987.pdfIn PDF document text
    • http://xuzunebizojebab.22web.org/ustad_abdul_karim_khan_songs_free.pdfIn PDF document text
    • http://reredikulole.22web.org/99383005811.pdfIn PDF document text
    • http://vijufik.iblogger.org/what_is_the_significance_of_religion_and_spirituality_in_our_society.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kazizalogovake.rf.gd/9979548448.pdfIn PDF document text
    • http://jipuzekas.rf.gd/63415182776.pdfIn PDF document text
    • http://pizubape.rf.gd/kisibakifirenatevoxutu.pdfIn PDF document text
    • http://nekezoxugi.rf.gd/excel_vba_sum_across_multiple_sheets.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_off0000dba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA4 4984 bytes
SHA-256: e0f64c18cfe21e0e3677fd0bba76c55346cb504409d553f401ec59723bbf5dbc
font_01_sfnt_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 10328 bytes
SHA-256: 1415db31b04f9b6bdf293a3314300b04c9abca085ec361deb4a59ac3ad1fb42b

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