Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba9289e197b0be8…

MALICIOUS

PDF

136.1 KB Created: 2021-04-20 08:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: af811c5c4e9d4fbfc3759f041a86d9c2 SHA-1: 1e56a09435df06d4013b27bd9e97955a93a7e42d SHA-256: 4ba9289e197b0be8faf9f7d771ed1c5f1be97ce527ba07ceb533fd770bee68e8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9995

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 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.
  • 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://jumiwimov.ru/strik?utm_term=educational+psychology+undergraduate+programs PDF link annotation
    • http://jugepawe.medianewsonline.com/andreas_moritz_ksiazki.pdfIn PDF document text
    • https://kufoxigokutef.weebly.com/uploads/1/3/1/8/131856815/a068bc99d32.pdfIn PDF document text
    • https://birugenok.weebly.com/uploads/1/3/4/6/134632973/kujufapu.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/inversion_uterina_tratamiento.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/dc369517-5d59-4b7b-b513-eb24e2b6bcfd/how_to_connect_surround_sound_to_tv_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31310ef6-7b46-49bc-bd79-a5848aa8cf6d/bivuribafudopav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f6ef390-b773-4a18-9103-ec22f85258e5/6553452023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa77525-0e09-47c1-884f-947c8dea740c/jenotitupewelegatit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c373d75-4516-49d4-8ad0-386a45265906/tuzopipazoxikurisejep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/143ffda2-465a-4665-a45e-9ff40247618e/nkjv_open_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89252cf0-a5e5-4064-8cc6-6b28fe16f001/how_to_use_a_teavana_tea_maker.pdfIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_a5b02db2f8f34ee0a2112e61af55dd5a.pdf?index=trueIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_6607023748d44998a0aacd780a88d30d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1bb434c-0e22-43fc-b9f4-321a3e7fa9f0/51443886893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce02f44-2132-411f-92f6-01505bb33270/lowrance_x49_manual.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_off0001daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAF8 5544 bytes
SHA-256: f1d799e41fa4cd36134bf6b429673bb379ef264eb1211328226b18d8fbdb860f
font_01_sfnt_off0001edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDB4 10784 bytes
SHA-256: 293fc6dbbe25f6400b6b1fcc3636ba376f03103f6c1e49d3c6da4ac20e89cff9

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