Malicious PDF — malware analysis report

Static analysis result for SHA-256 e318bfc0fd7701f8…

MALICIOUS

PDF

62.1 KB Created: 2020-11-07 11:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: eb7b633740f470ae3ff083ed81b62f2a SHA-1: 78768c08a43d92b48a421e847d5d769adb558779 SHA-256: e318bfc0fd7701f83ebc871764410ffd6bd67ef9665d7994b40f555692086b14
76 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a lure related to a "square and cube roots worksheet" and embeds a URL that redirects to a suspicious domain. This pattern is indicative of a phishing or malware distribution attempt, where the document itself is the initial lure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffnew.ru/123?keyword=square+and+cube+roots+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5f90e84eba895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f8cca26454e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_5f8bc3b8de3d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5f9314906ce35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5f8f097d1e71c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b3a4b6e0-8ef4-46de-8b7d-52beaee04deb/lafiwena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a0453a-1ac5-441e-b032-29edba8bb595/72879106563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73d52723-e670-45c8-9dca-759ba9018e68/vifewufeloxabeza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/422c2a28-8542-4d49-9650-f74d8b57981d/nerab.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/rizivomatef.pdfIn PDF document text
    • https://s3.amazonaws.com/texifaxepag/jofatiraburukufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e56f48-4bf4-4e0d-9dcc-b9e53cb6c0a4/scarborough_maine_department_of_public_works.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/bijijapuwegevuwanabado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e40bc6c-8ecf-4371-8ef7-13c0cf61c1cc/lawn_boy_10304_repair_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4CB 5356 bytes
SHA-256: ddcb6604386591ac0ce47c2244b01980570e772ef68a437a862c020e3b8c2c25
font_01_sfnt_off0000b6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F6 11776 bytes
SHA-256: 7b56413b2fc178e74d5998b2edbfc30a1730c10cf9e9a6ceb0c58e1a6e70f2f7
font_02_sfnt_off0000dd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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