Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f17e47f5fca86e…

MALICIOUS

PDF

39.2 KB Created: 2020-11-07 18:55:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f7b8e081399b2308265c0947c1cc3d85 SHA-1: ea70c12f5d7cfd828f452be2b8c7339dd9774399 SHA-256: c8f17e47f5fca86ee0c964905d0e2275c958f45fd0caeb8c9d4d8bdf94aa08f2
66 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 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 1.0000

Heuristics 4

  • 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://trafficel.ru/123?keyword=main+idea+worksheet+2nd+grade PDF link annotation
    • https://vabejodero.weebly.com/uploads/1/3/4/3/134378136/dabulan-xewirisugep-bagajajore.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/zedazamirube.pdfIn PDF document text
    • https://sefuzogesosemo.weebly.com/uploads/1/3/4/5/134579576/7555848.pdfIn PDF document text
    • https://fulodovujigiw.weebly.com/uploads/1/3/4/0/134016909/fivetuzu_kozemu_gibisuk.pdfIn PDF document text
    • https://sofugiri.weebly.com/uploads/1/3/4/5/134509821/riduba_mikiz.pdfIn PDF document text
    • https://gosedizomomusuw.weebly.com/uploads/1/3/4/3/134313056/fotezubizoxonal.pdfIn PDF document text
    • https://godadonalizubo.weebly.com/uploads/1/3/1/4/131437317/lejemaminudorava.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/37760435419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73cebffb-c5c8-4f5d-ba5d-90bb8f16d5da/kumon_answers_level_h_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0a1a23-f636-4ea7-b4e1-28eab9d331e5/6932474447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf2c621-e8dc-47dc-a596-259d9b3ce349/86722769148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/719f5253-b9e6-4973-b1c0-dfa738948366/xajamijipovizasevogafufe.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_off00005ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB5 5348 bytes
SHA-256: 0f20c0ebbee374a9c14a4d91a8e6a0954c1720e07304bacdb6c28cd56c6fdd5c
font_01_sfnt_off00006d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D01 10376 bytes
SHA-256: d3d2cd9aa221c4c2dedb6c1f41af74ceccba92e5a12e96e42d6e489494967e2d

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