Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fffa41a75038f9…

MALICIOUS

PDF

70.0 KB Created: 2021-03-15 09:58:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c07b7485a0c5cc58f9d696543d1ac470 SHA-1: 4798ce4ae25d9550647886aca79b9595f63efb9c SHA-256: 87fffa41a75038f92c83693d572dfa023ca488e0ab91984e0b6dd9cd2b488fa2
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 that point to disposable domains, suggesting a link farm designed to host or redirect to malicious content. The document body, though heavily obfuscated, contains keywords related to downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=xhosa+bible+download+pdf PDF link annotation
    • http://letnesil.xyz/fejevowedukowivipivatad0e8n1.pdfIn PDF document text
    • http://farvestnn.ru/zaruwekemofuwalovimurapabvkk8p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417995/normal_602902b81405a.pdfIn PDF document text
    • http://oneitstore.pro/abcd_movie_all_video6ul7k.pdfIn PDF document text
    • https://cdn.sqhk.co/pobisobat/DjhBMgh/29664951849.pdfIn PDF document text
    • http://1-bog.ru/mahesh_chavda_book_the_hidden_power_of_prayer_and_fastingtia9r.pdfIn PDF document text
    • http://help-copyrightservice.xyz/mercruiser_5.0_oil_filter_frama25g4.pdfIn PDF document text
    • http://amst-watch-v1.club/38150583371jq8yu.pdfIn PDF document text
    • http://mosdendy.store/57082034670nie9c.pdfIn PDF document text
    • http://omshop.space/bees_saal_baad_movie_480ps1xvw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459914/normal_5fe18d9ee4ca6.pdfIn PDF document text
    • http://swiss-gear-top.xyz/dovovawesepolafataranuf8ggyk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_5fdc48803598a.pdfIn PDF document text
    • http://znakomstva69.space/podasuvapalolokefakurebu3j94l.pdfIn PDF document text
    • https://cdn.sqhk.co/lusajiki/ddXqgec/lejujotuku.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/usmc_7_ton_technical_manualm0v5y.pdfIn PDF document text
    • http://lifegirls.site/power_supply_tester_user_manualjbwv1.pdfIn PDF document text
    • https://cdn.sqhk.co/badexejos/uheXgik/digicel_top_up_app_apk_download.pdfIn PDF document text
    • http://vitalia-transports.com/wemipenotujumorezatij9moub.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/jjhfji3/my_cloud_storage_2tb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/28025647172.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/englisch_gerund_bungen.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/96608217044.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/pudiva.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_off0000d543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD543 5240 bytes
SHA-256: 9c5995aae753fdadd0fef3240aaae651ca2eb83ca51795e7f009fbfa652c1aef
font_01_sfnt_off0000e71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71F 10544 bytes
SHA-256: 1e350e9aaa6d6cb3e312f9760e0ee267bafb9b6056903ed236b96670f237d0eb

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