Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3683a06e2db72c1…

MALICIOUS

PDF

69.8 KB Created: 2021-04-14 22:40:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 72498b5c61f7786ca9ddd0ffdb1cc2a9 SHA-1: 882efc5d6e0e9c973bb46d3227345735632bef21 SHA-256: f3683a06e2db72c15ee5d8def036694d248b26378f8b745fb477c7d56a8a370a
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical ClamAV detection and ML classifier flagging it as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to financial markets, directing users to a suspicious domain.

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://jumiwimov.ru/strik?utm_term=the+complete+guide+to+capital+markets+for+quantitative+professionals PDF link annotation
    • https://cdn.sqhk.co/rinugezig/9JBQiba/heroes_of_the_storm_global_ping_error.pdfIn PDF document text
    • http://konufij.22web.org/suwerutas.pdfIn PDF document text
    • https://gelupolo.weebly.com/uploads/1/3/5/3/135314506/c26ce52b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5fcb0c3626803.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367667/normal_6006aae222a9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386834/normal_5fd612da3f127.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/gmsGQ4U/hearts_deluxe_twitch.pdfIn PDF document text
    • https://vosuzupitozom.weebly.com/uploads/1/3/5/3/135313705/bc5070481c2.pdfIn PDF document text
    • https://reninifovebomul.weebly.com/uploads/1/3/4/3/134361606/9332999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_60183ead3dc05.pdfIn PDF document text
    • https://pixadodo.weebly.com/uploads/1/3/2/7/132740612/5c783b2922c91c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_f5ea42e535764872a9109c5cf1f4b1c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/little_red_riding_hood_characters_images.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/zogirazalotidomopojorawuk.pdfIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_df8c0a5b7cdd4b0482b9f1e4131756bb.pdf?index=trueIn PDF document text
    • http://bavuvemagijiwaf.epizy.com/23302196661.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/on_writing_well_chapter_11_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/wakoxiziwadadoretalaso.pdfIn PDF document text
    • http://binasizula.rf.gd/lovanomelanojefifipotu.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_off0000d2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EA 5768 bytes
SHA-256: 0f38bbefefe1681de335b9c8f93638e2ba36a32041002bb649104f9f9230dcb0
font_01_sfnt_off0000e65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65C 10292 bytes
SHA-256: 9b9728b8d92bf5406b03dcbdf13ac17886b934e76ef067bd5d57acc889abfb37

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