Malicious PDF — malware analysis report

Static analysis result for SHA-256 a790035a2e08e28a…

MALICIOUS

PDF

73.8 KB Created: 2021-06-09 05:39:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bfc7450b60c6747b9d41e31793924b61 SHA-1: b26b590de85c341c3127a44386f73d70847bfbcd SHA-256: a790035a2e08e28a692b2b1bfd90e92d7d5790e098fe217f4855698d11177410
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 0.9999

Heuristics 5

  • 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.
  • 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://allytemp.ru/pbw?utm_term=a+plastic+ocean+video+worksheet+answer+key PDF link annotation
    • https://zurenigexozaxil.weebly.com/uploads/1/3/4/6/134606750/lumapi.pdfIn PDF document text
    • https://bixuduserar.weebly.com/uploads/1/3/4/8/134861961/xunadoborekenedel.pdfIn PDF document text
    • https://kepijifawobi.weebly.com/uploads/1/3/5/3/135388201/betepuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_6068784a77ef1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498376/normal_60bd30af714e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_6052495236dde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470385/normal_601be8cfc61f1.pdfIn PDF document text
    • https://lewixukulir.weebly.com/uploads/1/3/1/6/131606807/179dd67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502511/normal_601b26a075daa.pdfIn PDF document text
    • https://forugizatufuru.weebly.com/uploads/1/3/1/4/131410167/810a38c63174f.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/82180068-7d49-4b9c-b655-167f44752268/remington_1100_20_gauge_serial_number_lookup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9b073a-000e-4d03-b5e7-610f8f27cb0e/how_to_set_up_msrm_repeater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e89fb397-cffc-44f6-93cc-71656c1c7d60/ar_15_magazine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db089dfb-8256-47ac-a5ee-bf87cc1b857c/ralph_waldo_emerson_essays_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63b7c65d-ee99-433b-8eb6-d26476365a5e/jijefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd7f3060-10e2-4ac3-b6c8-eaa983b25936/sapitagibaxelixijezegexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a12d40-52b7-4dd9-ba9e-e2f01767855c/56709947885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a167a792-d539-4c11-8048-17ea75ca4084/96851343853.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_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 5468 bytes
SHA-256: 0a224a4c661a11758edc12c4516234917153ea6cb6107e6eca08f7401708b634
font_01_sfnt_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 10344 bytes
SHA-256: 02f71f950f8f50d62f6eb8476103b64744d8fc33c2232cf7432d7a870a604216

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