Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a386476b59de85e…

MALICIOUS

PDF

73.3 KB Created: 2021-03-25 01:27:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 341ac616cf7ea69e793ea584c5d6dc1f SHA-1: b264f037fe302c167cf70726fbca578030601f89 SHA-256: 7a386476b59de85e784f3cf05ef140e0b333dc325343d9ea1c96035c08599d79
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to disposable hosting, characteristic of a link farm designed to manipulate search engine results. One prominent URL, 'https://xezojetit.ru/wix?keyword=bingo+pop+cheats+deutsch', is flagged as unknown reputation and is likely the primary malicious destination. ClamAV and ML classifiers strongly indicate malicious content, with the PDF_SEO_LINK_FARM heuristic confirming the deceptive link farm structure. The document body, though heavily obfuscated, contains keywords related to the malicious URL, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/wix?keyword=bingo+pop+cheats+deutsch PDF link annotation
    • http://ligugiban.scienceontheweb.net/european_society_of_cardiology_guidelines.pdfIn PDF document text
    • http://wugegifa.getenjoyment.net/reparacin_y_bobinado_de_motores_elctricos_gratis.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/wuxijuzugibasavip.pdfIn PDF document text
    • http://zaparipajomigi.scienceontheweb.net/primary_caregiver_tax_credit_registration_form.pdfIn PDF document text
    • http://gezesapifo.22web.org/76253426888.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea867069-fd07-450c-82b8-f7088a01d9e2/5278955571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d3b703b-6f48-42be-98a1-539d06c1d4a5/81854755115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fdd9e89-998f-4c42-9544-a34da775f8c7/gobiwameguxakeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22745d2-4cfa-4859-a559-f673b6190ade/oracion_para_encender_la_corona_de_adviento_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a863899-d805-4897-88ef-c9b26c207f98/sarore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50418e98-1d7e-4a1a-baf1-39945da3adb3/confessions_of_a_shopaholic_full_movie_watch_online_free.pdfIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_24a18b2d49b9456aacd69b8ccfbab254.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84fc6bce-3e08-4a28-9f56-7c4a6762522b/78135816017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bad5778-cf5b-4924-b114-c4aa337bc76f/sobodenipino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f80d7b6e-1bd5-40c9-b445-9a948be5d5b3/advantages_of_capitalist_economy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637d58f3-746c-4a4f-ae65-dbe9c748f478/organic_and_inorganic_compounds_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d14e6184-747a-43b3-8792-e37dc7a9400e/what_were_major_events_in_the_renaissance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c286214-11c2-4b49-81cd-a5fbd8a3376c/47368904462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a55980ca-1a9d-4613-80a3-d5f589598852/pigeligisivuno.pdfIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_0f683440d77140fe9b75c369ddaf76cc.pdf?index=trueIn PDF document text
    • http://fetekovabu.onlinewebshop.net/zerixuku.pdfIn PDF document text
    • http://wakerot.epizy.com/challan_281_form.pdfIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_decaaa18034846c2888d20b37157a99d.pdf?index=trueIn 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_off0000df9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9F 5256 bytes
SHA-256: bb3e9ccc253ecdc09312961863f48e6a8eeb81ad62b76dfab1cc34486c1220fa
font_01_sfnt_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 11300 bytes
SHA-256: 9cbb4f61f5998155b0441d6f98c9735a0e8cada62b61770d1999bc804295e590

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