Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65d8f76e9492d16…

MALICIOUS

PDF

75.9 KB Created: 2021-03-12 16:15:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 804f1ffe0a3bf22079cee75741350086 SHA-1: 24ae0e9a5569e1e8233afef5bf6677da13d4440c SHA-256: b65d8f76e9492d1659bc5824f47d9ab8832aa9d3c58c6c94ff5c75915c8fbf70
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary suspicious URL pointing to 'mezovuduw.ru'. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to 'data science' and 'big data analytics' to entice users to click the malicious link.

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://mezovuduw.ru/award?keyword=data+science+big+data+analytics+pdf PDF link annotation
    • http://moxejukube.22web.org/jagolerolokuvojazozepariw.pdfIn PDF document text
    • http://zurabutodiriwa.22web.org/50632916814.pdfIn PDF document text
    • https://cdn.sqhk.co/nakolore/Z8YRYjc/xaxajixonezukupodaj.pdfIn PDF document text
    • https://cdn.sqhk.co/kamavedes/jiBhbja/blocky_lava_facts.pdfIn PDF document text
    • http://xusetelokumupoz.iblogger.org/manual_relogio_chilli_beans_digital.pdfIn PDF document text
    • http://didavixakodix.22web.org/78511899831.pdfIn PDF document text
    • https://cdn.sqhk.co/feledigowud/hfJawcZ/gaguroxemafokafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wutopow.epizy.com/python_bottle_template_include.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43c19268-3738-400d-aa67-00c188231a9f/33512797423.pdfIn PDF document text
    • http://biborufa.epizy.com/28162007204.pdfIn PDF document text
    • http://fuvogixus.epizy.com/the_fall_of_constantinople_worksheet.pdfIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_9e0a541e34644cdc829be9b770e32688.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_083e1be2cd374f1886d8192941163372.pdf?index=trueIn PDF document text
    • http://napepezubebefiw.epizy.com/71565689214.pdfIn PDF document text
    • http://zagasazibizit.epizy.com/which_of_the_following_is_not_a_local_area_network_lan_topology.pdfIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_901b85f4e52e4c38839ebd98ada71bc2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d756fa8-0e86-4a45-abe6-565c8aa1e06b/espiritu_de_dios_chords_and_lyrics_para_guitarra.pdfIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_000f8e50bc8c42bdbf2e05ae12741f89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd081785-faed-4fbc-a094-122aeafc9966/miveratazoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8acd3eea-b5d8-4331-937a-eb676babeac7/79992741275.pdfIn PDF document text
    • http://virujafaxamer.epizy.com/38153249660.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_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 5468 bytes
SHA-256: 2ebac8b021937464e5361347a9b111357f0889d757b4924c8d869363d73b3ef5
font_01_sfnt_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 10916 bytes
SHA-256: 52b08ad96149992654e7eb63193cad141a1e91c3290e99130e41d8bb3cf79c62

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