Malicious PDF — malware analysis report

Static analysis result for SHA-256 24301a3ce241d7ba…

MALICIOUS

PDF

79.6 KB Created: 2021-03-09 15:21:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e04d95355a3793c3fb93c0f04c29e084 SHA-1: 7c3c109583d1d354c66b2cac11708c9fa17e5fbf SHA-256: 24301a3ce241d7baacd56b37013d0056499ddc212425875f4937500b77b8b556
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous external links to other PDF documents, likely for SEO manipulation or to distribute further malicious content. The primary malicious URL identified is https://seumenha.ru/award?keyword=twisted+python+tutorial+pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=twisted+python+tutorial+pdf PDF link annotation
    • https://cdn.sqhk.co/reparepoki/jbBjdjV/quran_teacher_jobs_in_lahore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_5fe99e3059a7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450424/normal_5fcc5ac46793d.pdfIn PDF document text
    • https://cdn.sqhk.co/wenavuso/dhfhi2D/lodokitosivadepabiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478968/normal_601f2926ec636.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/iajc8xE/xbox_series_x_walmart_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/Cd0jjge/rotator_cuff_tear_test_names.pdfIn PDF document text
    • http://xidakuxekon.22web.org/tenobegarajokez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4859805/normal_603aae001ce46.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/ioqieja/bezekavuxuweduwig.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/5b2cf80b-2b96-439a-a1f9-f16b0ab49b69/22843698371.pdfIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_0bbd2622eff94315ad22ba9fc81541df.pdf?index=trueIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_8508b3dac993440b85ef021a50277824.pdf?index=trueIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_8c5318f01dba40b19977037b40994c45.pdf?index=trueIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_c8fa225d46ec47e88570992a6f0c37bb.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_81246c062f2f4d22adac302cbea8ff58.pdf?index=trueIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_20f17b3295234185b37166c86c5b7ab6.pdf?index=trueIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_954ae730c8764b14a7a501553d485da1.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_c0066682bd6e44c997c24d4cfc16d074.pdf?index=trueIn PDF document text
    • http://golunelew.epizy.com/samsung_series_6_led_tv_65_inch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae4e39db-b8e5-4dee-81f1-02c5f1248508/forewuzetegaxifupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acef80ee-b0fc-4019-8931-6c0ac1e59a88/esl_gerund_infinitive_exercises.pdfIn PDF document text
    • http://retesatitogeli.epizy.com/48715671441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d35f28-a456-498b-8c4c-10cfbe15f62d/27127534344.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_off0000fa3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 5272 bytes
SHA-256: baf78bc4cc66b49f3705df1f089a0af2578f64832b5305d24e36e1225666cadf
font_01_sfnt_off00010c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3A 11192 bytes
SHA-256: 02c782abef9e7b29e914ae561dfc3e2b834977e8e03202836222acd423267889

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