Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e67b75be54bd1b…

MALICIOUS

PDF

71.6 KB Created: 2021-03-23 21:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5902a27d6461f89a67dc7ff2f7b343c7 SHA-1: 7e6c3204ca56ec9e1e2a763ed5696d04a5911713 SHA-256: 19e67b75be54bd1b384531921d5b3ec57274d2da8c7b15c50ed468a4e0da637d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/wix?keyword=david+tanaka+md+denver PDF link annotation
    • https://cdn.sqhk.co/rukugewul/jyqij4Z/98462656320.pdfIn PDF document text
    • https://cdn.sqhk.co/solijisivono/kT4icFj/35272210358.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/furUD3s/wildlife_park_wild_creatures_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454172/normal_60418e9d48b39.pdfIn PDF document text
    • https://cdn.sqhk.co/senosekagoko/idghMij/65193231818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498324/normal_603e286eab51b.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/haIEvgf/teduzutusutirogavaf.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/jaAjbZc/36169044028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499958/normal_6030404c2cf98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_60281e4c3ac92.pdfIn PDF document text
    • https://cdn.sqhk.co/radojiga/fiaiaoM/fevaferisuxazukuzejidizo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_fc3ec17a7038487981c8ff520620e3f1.pdf?index=trueIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_811aa68ddf3844388fbad7e0aea1db2c.pdf?index=trueIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_fea7192641fb411f81af62be1fb1c5f0.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_86edc83332dd460da2f63c4beab91f1e.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_f57dd7110ed04938aa0d593982f367ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutasujal/58778274850.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/vuwakolinuvufegeka.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/90780364475.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_0ded8c55eb3c430fbb425ced38649473.pdf?index=trueIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_02d2b90030dd4a15a186cb20b17a67de.pdf?index=trueIn PDF document text
    • https://3b1a0cff-dc54-4917-88c1-cdf904a8db56.filesusr.com/ugd/60aab8_9a96099a078e48f4afcec292b0e23aa7.pdf?index=trueIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_6e56879d2f1749fcbc8501ca1b5a8ee7.pdf?index=trueIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_923daafc27fa47219ab040e6c4fcf395.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_off0000dbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 4884 bytes
SHA-256: b3cc14b7effc143dacdbdbaa3383c8b8f716cc90b79afe4e5a952bc9ddc434c4
font_01_sfnt_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 10616 bytes
SHA-256: efca4efc6bda03155e43ad4ec1fbecb4b41f1dd3f37e39c34bd788c7f51c5965