Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a58385c394421f…

MALICIOUS

PDF

76.5 KB Created: 2021-03-12 02:17:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 993cb77141a001cd3ca7cd873752b104 SHA-1: 2816914e05339b97512f6a274b40b79850542559 SHA-256: b8a58385c394421fc7d984a3f26c8d26082dd6a97ae9476f69bffc3a15dbb9db
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. The embedded URLs suggest a potential redirection to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://seumenha.ru/award?keyword=bosch+mass+air+flow+sensor+pdf PDF link annotation
    • https://kosilamegorigi.weebly.com/uploads/1/3/1/4/131409210/740444c5.pdfIn PDF document text
    • https://tekofudarazot.weebly.com/uploads/1/3/1/3/131381521/9d34dd.pdfIn PDF document text
    • https://dupagerenukuxat.weebly.com/uploads/1/3/4/7/134751723/e14dd568392397f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375076/normal_6011f1e9996fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420034/normal_5fc5a8f8948e5.pdfIn PDF document text
    • https://vagonegasix.weebly.com/uploads/1/3/1/4/131482995/ae8a2f04eabdc0.pdfIn PDF document text
    • http://faxusigeroles.sportsontheweb.net/descargar_diccionario_biblico_cristiano_en_gratis.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/mini_cooper_service_manual_r56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_5ad1a2e4d2cc4bc58d8391e858addf16.pdf?index=trueIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_1830b02743b246c999c1946f13e63508.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82857522-df01-4467-b22b-48d481172535/the_world_is_too_much_with_us_theme_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33af6d33-58fc-412e-90aa-5d75990f7870/tropic_of_cancer_and_capricorn_explained.pdfIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_55da178048c74f56aebf4818150e1aa3.pdf?index=trueIn PDF document text
    • http://wizigipixe.atwebpages.com/70972219343.pdfIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_810bd2a336284de69db36bbc10f2d959.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/440a76ab-2765-432e-9ff0-8068b2a574c5/technics_sl_d20_turntable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e371d10-ee07-48e8-a593-0ee4728dcd5a/puzifavosojilitaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab247c3c-0161-44ae-be15-ab17bd6658b0/46912643690.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_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 5536 bytes
SHA-256: 3a044b4acf91d4b9d4126a6d7284917d766e7d752a19d7aa714fc9e93f385640
font_01_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 15040 bytes
SHA-256: 82d13b65b239d20aeade2f9e40e7d5b119bdb6a4f46b184954f29d99da6cef32

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