Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2b86a319708022…

MALICIOUS

PDF

180.2 KB Created: 2021-02-19 04:15:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b6d06f510fc821ffdfc0ae8816450f40 SHA-1: b548b43523b3e154b46ed63eee45d9910fb6fb5f SHA-256: fa2b86a319708022106ec46d51245cd7980e5318614da77b9cd1c4863ea75448
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The embedded links, such as 'https://crophysi.ru/wix?keyword=brave+new+world+social+classes+quotes', are designed to lure users to potentially harmful websites. The document body itself appears to be malformed or obfuscated, providing no clear user-facing content but containing metadata related to its creation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=brave+new+world+social+classes+quotes In PDF document text
    • https://static.s123-cdn-static.com/uploads/4388041/normal_60017802a79ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465018/normal_5fdc325fe8312.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/hjj4mDd/kanto_yu6_vs_klipsch_the_fives.pdfIn PDF document text
    • https://cdn.sqhk.co/pukefoxer/d03hfDC/lebara_phone_number_find_out.pdfIn PDF document text
    • http://wirelessinfo.ru/260634918387j3i.pdfIn PDF document text
    • http://famekeletiti.iblogger.org/89768150291.pdfIn PDF document text
    • http://smcjd.com/best_dream_islands_acnhgziw9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454966/normal_5fdad8e47fd33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493282/normal_5fed103634562.pdfIn PDF document text
    • http://jetaxopavajuluw.22web.org/kesapiko.pdfIn PDF document text
    • https://cdn.sqhk.co/foseziwate/Ijfhfhh/54122957635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480878/normal_6025a48b42b02.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/hNicgr6/fast_lane_biker_magazine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403413/normal_5fe5772d96fdc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nanugubodiw.epizy.com/xurunasaxot.pdfIn PDF document text
    • http://dolifusekaxug.epizy.com/agendas_alternatives_and_public_policies_free.pdfIn PDF document text
    • http://vubalek.epizy.com/resilient_sheet_flooring_definition.pdfIn PDF document text
    • http://radoletoma.epizy.com/annexure_c_form_for_pensioners.pdfIn PDF document text
    • http://melumudinev.epizy.com/4801805631.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0002906d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2906D 28972 bytes
SHA-256: bfbd2d088a8e76fe14e3089b0fc89f3646ceb3ce761ec6ce9a9c1ba7708d8fe6
font_00_sfnt_off000242bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x242BB 5260 bytes
SHA-256: 8c1d6157612cc3589f65e6331a305cfe14ef83c61a38208734c5e65e2b82e8d8
font_01_sfnt_off000254bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x254BD 20200 bytes
SHA-256: d3397ad73ed51bd24cb4c44f5599ff1c4111c8a8ce2bd554bedd2d17a459d22d

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