Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e7748e25a0ae78…

MALICIOUS

PDF

74.3 KB Created: 2021-03-18 05:16:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d2b811cc5f9525c6a49c61026ce4a725 SHA-1: ba2feed1aa89918582b4264433c36053c0176c23 SHA-256: d1e7748e25a0ae783f17f1d3e7e4f59a80c2ee682ec7b065d015ee3300c72b27
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or link farm attack. It contains numerous external links, many pointing to disposable hosting, and is detected as malicious by ClamAV and an ML classifier. The document body, though heavily obfuscated, appears to be a lure related to a book title, suggesting an attempt to trick users into clicking on the embedded URLs for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=bayesian+data+analysis+third+edition+gelman+pdf PDF link annotation
    • https://cdn.sqhk.co/jusitufugaf/m31ARgV/95652336083.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/eeja4ji/rockauto_reviews_bbb.pdfIn PDF document text
    • http://itgermany.net/95582159093hzy95.pdfIn PDF document text
    • https://cdn.sqhk.co/sakupiraf/hegj5gv/bigalaxalubewu.pdfIn PDF document text
    • http://oneshops.space/7491208204105xut.pdfIn PDF document text
    • http://1xbet-registr.site/55046199102oz5h7.pdfIn PDF document text
    • https://cdn.sqhk.co/lebuxexofe/i52Eher/dangal_serial_time_table.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_ca48bd7c934d41d88f2708d2e47c4ba2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/258c7446-ac19-4335-a031-737762233ce7/line_6_spider_iv_30_clean_setting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2407c93-e42d-479d-b8af-0a51abde34c1/90954026274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dfd0a63-980d-4881-9a0e-6bd896d53a29/wowesevivadovutonejekosuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/425dbb6c-58bf-4e43-8e7c-0d3542a6936f/the_world_of_darkness_books.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_1eeaabdd19ed4e06881e5d9ad109aa5e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f9296aa-eeca-42e1-9aa6-4bf8b70f3ede/39626887253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f18db3-202c-44f3-a9eb-52448225f45a/xebefanekamepezepape.pdfIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_af3ed220b5644749a0626b64494d8490.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/bavotizopimekopedizaj.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/adobe_animate_highly_compressed.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/vivap.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_off0000e3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E1 5604 bytes
SHA-256: 24f8d30bc2301de1f0e5a4d17973d242e7890bc343f225aa44b1809ac276e9ae
font_01_sfnt_off0000f6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 10740 bytes
SHA-256: 3fb823850904f7fa5603d33fbcbb7faaa1ae926f6212f27144ef41bc706dbf9d

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