Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1feeed2875001fc…

MALICIOUS

PDF

87.1 KB Created: 2021-02-26 21:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 11cc99c67cbd63923e34c8cb2d1f67e0 SHA-1: ece3f99172e3d9bc71036b84de786250ee2a6fd7 SHA-256: a1feeed2875001fc289daa22b6231188b35272fa4dc9adae6bb02ab7acc68b74
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ClamAV and an ML classifier. It contains multiple embedded URLs, with a primary focus on redirecting users to a link farm hosted on disposable domains, disguised as search results. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final malicious destination through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=percy+jackson+movie+cast+sea+of+monsters PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471704/normal_6023e0cbb1745.pdfIn PDF document text
    • https://vunukufe.weebly.com/uploads/1/3/4/6/134640969/rosaribitar_zakelubero.pdfIn PDF document text
    • https://ruxetire.weebly.com/uploads/1/3/1/3/131379726/mizipibifapiluf-rofuvu-jazarukowapuj.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/35673407126.pdfIn PDF document text
    • http://tobalalupuvobiv.iblogger.org/manuale_officina_majesty_250_dx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379839/normal_601c6531b15d4.pdfIn PDF document text
    • https://wigemixez.weebly.com/uploads/1/3/4/2/134265991/f1fabbc786ae9.pdfIn PDF document text
    • http://pusolaxunu.66ghz.com/resume_templates_for_mac_pages_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xeroguru/lowdermilk_beach_red_tide_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/ajax_submit_form_data_jquery.pdfIn PDF document text
    • http://sebipukavore.epizy.com/oecd_guidelines_on_intra_group_services.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/29816818099.pdfIn PDF document text
    • http://piwirapofo.epizy.com/lukupekafidijeteduniva.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/35387810678.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/jakukijuzotiximulan.pdfIn PDF document text
    • http://vedajimiti.rf.gd/follow_us_on_social_media_template_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 5088 bytes
SHA-256: 6c8f7feeb8f8573ff787a692a029ad43e071e04dd9e7975d5f60a272109763ad
font_01_sfnt_off00010704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 10724 bytes
SHA-256: c8a892359daf09f540758d5a96163e6d8b42bef2c863b01bd9d9a7a177d4acb6
font_02_sfnt_off00012bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF2 16028 bytes
SHA-256: 13adf508137d8c465935a7a142060f5d940462760dc3fd3f5061e956d2f2222b
font_03_sfnt_off0001403a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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